Reference:Serial-numbers

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Rolex case serials run on three systems by era: a long numeric counter through 1987, a single-letter prefix from 1987 to mid-2010, and a random alphanumeric string after that. A serial dates the case alone, and the year it gives is always approximate. Vintage authentication needs the serial to agree with the bracelet, dial, and movement.

The three systems

The numeric counter ran through 1987 and carries the famous 1954 reset at the 999,999 ceiling. The single-letter prefix took over in 1987 and ran until mid-2010. Random alphanumerics took over after that. A separate system on the bracelet clasp uses its own date codes and is sometimes mistaken for the case serial.

Numeric serials (≤1987)

Rolex never published a year-by-year numeric serial chart. Collector dating rests on two books. Carlo Pergola's Rolex Daytona, A Legend Is Born carries the densest mid-century ranges, and Jeffrey Hess and James Dowling's The Best of Time: Rolex Wristwatches covers the longer early span. The two agree on most bands. Where they differ, the gap is usually a year at the edge of a transition.

Serial range	Production year	Notes
≤30,000	1928–1934	Earliest known Oyster serials. Per Dowling: 23969 = 1928, 28290 = 1930.
30,000–100,000	1934–1940	Bubbleback / early Oyster era. Per Dowling: 35365 = 1935, 99775 = 1940.
100,000–500,000	1941–1947	Per Dowling: 143509 = 1942, 387216 = 1946, 529163 = 1947.
500,000–950,000	1947–1953	Pergola and Dowling agree: 628840 = 1948, 710776 = 1951, 840396 = 1952.
950,000–999,999, then reset to 10,000–139,000	1953–1955	The famous 1954 reset to a new 10,000-start counter. Per Pergola: 982115–10001 = 1954, 10001–32160 = 1954, 63425–139166 = 1955.
139,000–360,000	1956–1957	Per Pergola: 139167–261715 = 1956, 272289–360988 = 1957.
360,000–530,000	1957–1959	Per Pergola: 426481–437254 = 1958/59, 437255–530168 = 1959.
530,000–785,000	1959–1961	Per Pergola: 539969–663484 = 1960, 688767–785296 = 1961.
785,000–1,000,000	1961–1963	Per Pergola: 840046–919916 = 1962, 950451–974197 = 1963.
1,000,000–1,500,000	1964–1966	Per Pergola: 997136–1104068 = 1964, 1284790–1503591 = 1966.
1,500,000–2,000,000	1966–1969	Per Pergola: 1503592–1534082 = 1966/67, 1720977–1938064 = 1968.
2,000,000–2,600,000	1969–1971	Per Pergola: 1958607–2236978 = 1969, 2558657–2591204 = 1970/71.
2,600,000–3,500,000	1971–1972	Per Dowling: 3215500 = 1971, 3478400 = 1972.
3,500,000–4,000,000	1973–1974	Per Dowling: 3741300 = 1973, 4004200 = 1974.
4,000,000–6,000,000	1975–1980	Both captured charts thin out here. Working approximation: 5,000,000 ≈ 1976, 6,000,000 ≈ 1979/80.
6,000,000–9,900,000	1980–1987	Pre-letter terminal range. Working approximation: 8,000,000 ≈ 1984, 9,000,000 ≈ 1986. Boundaries vary by ±1 year across published charts.

Letter serials (1987–2010)

The case carries a single letter stamped between the lugs at 6 o'clock, followed by six numeric digits. The R prefix arrived in 1988 on the first 16520 production and ran in parallel with terminal numeric serials for several months. Coverage from R through P (1988–2000) is well-documented across Daytona, Submariner, GMT-Master, and Explorer auction lots; coverage from K through G (~2001–2010) is collector-canonical but anchored by fewer primary-document references.

Letter	Production year	Notes
R	1987–1988	First post-numeric letter. 16520 first-year production carries R serials; also seen on late 5513, 16700, 14060, 14270, and final 1675 batches.
L	1987–1989	Overlapped with R for several months across the numeric-to-letter cutover. 16520 second-year (Floating + 4-lines dial).
E	1990	16520 Inverted-6 dial era starts here.
N	1991	Documented on a Sotheby's-catalogued 1991 yellow gold 16518 with white Panda dial.
X	1991–1992	Overlapped with N (1991) and C (1992).
C	1992	Last clean single-letter year before the 1993–1998 transition.
S	1993	16520 78360 → 78390 bracelet cutover on most documented examples. Note: an "S" leading a clasp date-code is a different signal — it marks a service-replacement clasp, not a 1993 production year.
W	1994–1995	Part of the documented T/W/U/V/Z overlap window.
T	1995–1996	16520 Patrizzi-eligible mark range (1993–1997). Part of the T/W/U/V/Z overlap.
U	1997–1998	16520 tritium-to-Luminova transition; SEL bracelet introduction.
A	1998–1999	16520 Luminova MK7 era. Some sources extend A through 2000.
P	2000	Final Zenith-base 16520 year. Anchored by Sotheby's 116528 case P421022, first-year in-house cal 4130 production.
K	2001–2002	Working consensus across collector resources; not directly anchored by a published primary source.
Y	2002–2003	Sotheby's 116528 case Y'239'786 carries an October 2002 guarantee. 16610LV launch examples appear at autumn 2003.
F	2003–2004	16610LV low-F-serial production October–December 2003. Also early 116710LN and the 16710 D-serial transition.
D	2005–2006	The Vintage Rolex Field Manual ties 16710 stick-dial Mk5B production to D-serial onward, from 2005.
Z	2006–2007	Late 16710 stick-dial production. Working consensus year boundary.
M	2007–2008	Late 16710 (final production) and early 116710LN. Working consensus year boundary.
V	2008–2009	Late 14060M, late 16710, and early-mid 116710LN era. Working consensus.
G	2010	Final letter year. Wind Vintage 116523 GT Champion (2010 production, 2011 caseback engraving) carries a G prefix. Randomization began mid-2010, so G appears on cases from the first half of 2010 only.

Two letter windows need extra caution. N, X, and C overlap around 1991–1992. T, W, U, V, and Z overlap through 1995–1998. In both windows the serial narrows the year band, but does not pin it by itself.

A leading S on a clasp date-code marks a service-replacement clasp, not a production year. The same letter appears in the case-serial alphabet as the 1993 prefix, which sometimes confuses collectors who see "S" stamped on a clasp blade and assume the watch dates to 1993. The two systems share letters but live on different parts of the watch.

Random serials (mid-2010 onward)

Rolex randomized case serials from mid-2010 to defeat counterfeit decoding and to obscure production volume. The cutover happened at roughly the same point as the final letter prefix (G) on case stamping. Post-2010 cases carry an alphanumeric string of mixed letters and digits with no public year mapping, and Rolex has never published a decoder.

For modern references the serial does much less. The reference itself usually gives the useful year band, while the random case serial adds almost nothing beyond confirming the watch is post-2010. After 2011 the clasp codes also randomize. For a precise year, paperwork or Rolex service history matters more than the serial.

Pre-1948 vintage references and hallmark dating

For vintage references produced before approximately 1948 — including the Prince family (971, 1490, 1491, 1527, 1862, 3361, 3937), the early Bubbleback era (2574, 2764, 2940, 3065, 3132, 3458, 3595), and the early Oysters — the numeric serial system on its own is rarely sufficient for precise dating. Movement and case numbers were not always issued in strict chronological order, and Rolex's own archival material for the pre-WWII period is incomplete. The standard collector practice is to anchor the date through case import hallmarks rather than serial numbers alone.

Glasgow and Edinburgh assay marks

British retailers required imported watches to be assayed and hallmarked by a British assay office before sale. Rolex used Glasgow most heavily, with Edinburgh and London also represented. Each assay office stamped the case with a year-letter code that pins the import date to a single year. The four marks present on a Glasgow-imported Rolex case are: the case-metal purity mark (`9` and `375` for 9K, `18` and `750` for 18K, `STG` or sterling lion for silver), the Glasgow town mark (a treelike emblem), the year-letter code, and the sponsor's mark (typically Rolex's own RWC Ltd punch). The year-letter alphabet rotates on a 25-letter cycle, with the letter shape changing across cycles to avoid ambiguity.

For pre-1948 Rolex specifically, the practical dating workflow:

1. Pull the case from the strap and examine the inside of the caseback under loupe. 2. Identify the four hallmark stamps. The year-letter is typically the smallest of the four. 3. Cross-reference the year-letter against the published Glasgow / Edinburgh / London assay tables (most collector hallmark guides, including the *Vintage Rolex Field Manual* by Colin A. White and standard British silver hallmark references, carry the full year-letter chart). 4. Cross-check the result against the movement number range for the same period — a clear discrepancy between hallmark year and movement-number-implied year is a service-replacement signal.

A specific example documents the workflow on the 971 reference: Antiquorum NY March 2010 lot 401 sold a sterling silver 971 with English hallmark dated 1928, case 70,064, movement 7,216, from the Arman Collection. The hallmark establishes the year of British import; the case and movement numbers fall within the documented 1928–1930 silver-import range, corroborating the hallmark date. This is the earliest documented 971 in the surfaced auction record.

Why the serial-system year-letter chart fails for the Prince era

The Rolex letter-prefix serial system documented above (1987–2010) postdates Prince production by 50+ years. The pre-1987 numeric system was sequential rather than calendar-locked: serial ranges advanced as production volume cleared blocks of numbers, and a watch with serial 70,000 in one year of pre-WWII production might overlap with a watch numbered 80,000 in the same year of a different reference. Rolex's own archival material for the era is incomplete, and the published numeric-serial-to-year correspondences cover the post-WWII era reasonably well but become unreliable before 1948. For a 1928–1945 Prince or pre-WWII Bubbleback, the case import hallmark is the more reliable anchor.

Prince case-number anchors

The Prince family is the densest documented case-number-to-year correspondence in the surfaced auction record. The cases are sequential within a configuration (e.g. 9K Glasgow imports), but not strictly sequential across all 1928–1945 production. The following anchors are useful starting points; cross-check against the case import hallmark before relying on a case number alone.

Reference	Case number	Material / configuration	Hallmark / dating	Source
971	70,064	sterling silver	English hallmark **1928** — earliest documented 971	Antiquorum NY 2010 lot 401 (Arman Collection)
971	70,668	sterling silver	Glasgow **1929**	Bonhams London 2018 lot 37
971	71,883	sterling silver	c.1929–1930	Sotheby's 2019
971	011,651	steel + Beyer-double-signed dial	c.1928 (NOS, found 1998)	Phillips Geneva X CH080319/17
971	6,013	platinum, Cal. 300 7½′′′ 18-jewel	c.1935	Phillips Geneva V/X/XIV (sold 3×)
971	6,047	platinum	1935	Phillips 2015 Watch Auction One lot 210
971	6,077	platinum	c.1930	Antiquorum 2013
971	1,472	stainless + 14K, Eaton 1/4 Century	dedication "1907–1932"	Monaco Legend July 2019 lot 156
971	60,206	9K bicolor "Zebra"	c.1934	Antiquorum 2020 lot 235
971	65,196	18K Tiger Stripe (971A)	c.1930	Antiquorum 2015 lot 275
971	65,377	18K Tiger Stripe (971A)	c.1932	Antiquorum 2006 lot 316
971	68,305	9K bicolor "Zebra" (971A)	c.1932	Bonhams NY 2017 lot 133
971	68,591	18K Tiger Stripe (971A)	c.**1938** — latest documented 971A	Bonhams HK 2023 lot 644
971	74,768	stainless steel (971U)	box + papers	Antiquorum 2024 lot 462
1490	13,009	18K yellow gold	Glasgow **1933**	Phillips NY 2023 NY080223/92 + Sotheby's 2019 L19070 (likely same watch)
1490	17,365	steel + pink gold	Cal. T.S. 300 Ultra Prima, **1935**	Antiquorum May 2006 Mondani lot 46
1490	38,525	steel + Bucherer-double-signed dial	c.1937	Sotheby's Watches Online July 2019 lot 13
1490	58,115	18K (group lot with 1862)	c.1930	Christie's Geneva 1395 lot 307
1490	73,910	steel	c.1936	Bonhams Nov 2023 lot 50
1490	309,367	14K Observatory grade	caseback dedication **1947** — latest documented Prince case	veryimportantlot
1862	1,608	9K	Glasgow **1934** — earliest documented 1862	Antiquorum 249-98
1862	16,237	9K Glasgow + Cal. 527	Glasgow 1934	Christie's online lot 31 (sale 13523)
1862	16,663	18K (group lot with 1490)	c.**1938**	Christie's Geneva 1395 lot 307
1862	280,124	18K yellow (1862A variant)	c.1930	Sotheby's NY 2018 n09911 lot 53
1491	(Glasgow 1930)	18K yellow gold jump-hour Brancard	Glasgow Import mark **1930** — earliest documented 1491	Bonhams sale 29152 lot 23
1491	F2149HS	white-gold 1491HS Bucherer-retailed	c.1945 (original Bucherer invoice)	Antiquorum 2008 lot 692
1491	F220	two-color 18K gold 1491HS jump-hour	c.1930	Bonhams sale 29152 lot 6 (also 2024 lot, F220 stamp)
1527	(Vicenza 1992 lot 146/5)	18 ct white + pink gold stepped Railway, beads-of-rice bracelet	1930s — earliest documented "Prince Railway" catalog naming	Antiquorum Vicenza Oro 1992 lot 146/5
1527	189	18K white + yellow gold stepped Railway, original bamboo bracelet	dated **1931** (corpus high CHF 27,140)	Antiquorum May 2006 Mondani lot 108/33
1527	6920	18K white + pink stepped (catalogued "1527 M")	c.1930s	Drouot lot 182 (M suffix unexplained — working hypothesis: factory bicolor variant code)
1527	6936	18K white + pink stepped	Glasgow **1931**	EveryWatch lot 378
1527	(1940s)	steel + gold-filled stepped Railway	1940s — late-production end of 1527 line	Bonhams NY 2006 sale 15217 lot 9
3361	899,568	18K yellow gold Aerodynamic	dated **1952** (Mondani Collection)	Antiquorum May 2006 Mondani lot 108/210 (hammer CHF 18,880)
3361	899,677	18K pink gold Aerodynamic with monogrammed escutcheon	dated **1952**	Antiquorum May 2006 Mondani lot 108/209 (hammer CHF 21,240 — corpus high for 3361)
3361	(mvt T94122)	18K yellow gold Aerodynamic	c.1940	Antiquorum NY December 2015 sale 296 lot 73 (hammer USD 16,250)
3361	T61239	18K Aerodynamic — included in Phillips "Rolex Milestones" exhibition	(year not retrieved)	Phillips "38 Timepieces That Made History" Hong Kong
3361	59,330 (mvt 1,847)	18K pink gold with Cuervo y Sobrinos co-signed dial	(Cuban retail channel)	PatekMonger / Grailium / 1stdibs (dealer-level only — not auction-confirmed)
3362	62,482	14K pink gold Aerodynamic case	c.**1935** — earlier than canonical 3361 production; Friedberg dates 3362 to 1940 (contradiction unresolved)	Antiquorum May 2015 sale 291 lot 109 (hammer CHF 11,250)
3937	64,190	14K yellow gold Rams Horn	**1938** — earliest documented 3937	Bonhams 2023 lot 50 (production-launch anchor)
3937	(Garbett presentation)	14K yellow gold, Eaton 1/4 Century Club	dial: post-service Rolex-signed; caseback: "Presented to Sidnet Garbett... 1926–1951"	Sotheby's NY 2020 lot 73
3937	(Bird presentation)	14K yellow gold, Eaton 1/4 Century Club, 21×45mm	caseback: "Presented to Donald M. Bird... 1926–1951"	1stdibs (dealer-level)
3937	(McMackon presentation)	14K yellow gold, Eaton 1/4 Century Club	caseback: "Presented to Fred W. McMackon... 1928–1953" — latest documented 3937 Eaton presentation	Collectors Weekly family-heirloom story
6222 (Eaton successor)	(King presentation)	automatic Oyster — post-Prince Eaton continuity	caseback: "Presented to Reginald A. King... 1929–1954"	Antiquorum HK 2005 lot 86/19. Documents Eaton program continuing past the rectangular Prince era through 1966

The pattern: Prince case numbers run in the low-to-mid five digits for sterling and 9K Glasgow imports across 1928–1937; the platinum 971 examples cluster at four-digit case numbers (6,013 / 6,047 / 6,077) consistent with low single-digit annual platinum production; the 1862 reaches into six-digit case numbers (280,124) on the 1862A 18K configuration; and the latest documented Prince case (309,367 on a 1947-dedicated 14K 1490) sits at the top of the surfaced range, bracketing Prince family production at approximately 1928–1947 for absolute outliers. Mid-1940s production is rare; the bulk of the surfaced corpus dates 1929–1937.

Caseback engraving conventions

A second dating signal on pre-1948 references is the caseback engraving style. Period-correct factory casebacks are stamped, not engraved — the marks are physically pressed into the metal at production. Hand-engraved caseback markings indicate post-factory work: either a re-engraving on a worn caseback or a replacement caseback engraved by a service shop. The exception is owner-presentation engraving (recipient names, dates, club affiliations) and retailer-program engraving — the Eaton 1/4 Century Club presentations on Princes are the canonical example, with caseback inscriptions like *"Presented to T.D. Switzer to mark a quarter-century of continuous service with T. Eaton C., Ltd., 1907–1932."* Presentation engraving sits alongside the factory stamping rather than replacing it.

Vintage Submariner / Explorer / GMT case-number anchors

The 1953–1979 vintage Sub / Explorer / GMT-Master cluster carries case-number bands tight enough to date heads to a year or two within each reference. The numeric-serial tables above give the broad year-bands; the per-reference anchors below tighten the dating once the reference is identified. Cross-check against the inside-caseback Roman-quarter date code where present (II.53 = Q2 1953, III.57 = Q3 1957, IV.55 = Q4 1955, etc.).

Reference	Case number	Configuration	Year	Source
6204 (Submariner)	949,136	honeycomb dial	1953	Phillips Geneva XII 2020 lot 177 (CHF 75,600)
6204	988,613	gilt, US Navy provenance	c.1953–54	Sotheby's 2018 lot 250
6204	988,773	Sub-Aqua, end-link 65	1954	Phillips Geneva Watch Auction TWO 2015 lot 292
6204	988,923	pencil hands, gilt	c.1954, clasp 2.53	Phillips NY Watch Auction 2021 lot 79 (USD 233,100)
6204	988,929	Sub-Aqua tropical	1954	Antiquorum Geneva 2013 lot 577
6204	42,439	Sub-Aqua "prototype" (post-reset)	1954	Monaco Legend 2019 lot 69 (EUR 78,000)
6205 (Submariner)	21,354	pencil hands, no-Submariner dial, riveted Oyster end-link 65	c.1954, Series 1	Phillips Game Changers NY 2019 lot 54 (USD 162,500)
6205	21,442	Mercedes hands, gilt gloss, stretch riveted bracelet	c.1954–55	Sotheby's Fine Watches 2022 lot 13
6205	21,644	re-lumed reprinted no-Submariner dial	1954–55	Antiquorum Geneva 2025 lot 377-180 (CHF 16,250)
6205	85,972	Mercedes, gilt no depth (Series 2)	1955	Sotheby's Important Watches NY 2019 lot 178
6205	86,033	Atelier de Restauration 2023 restoration	1955	Sotheby's Important Watches II 2025 lot 336
6200 (Submariner)	320,xxx–322,xxx	Big Crown 8mm Brevet, A296, Explorer or red depth	1954–56	Foulkes 2024 reads 303 examples total in this cluster
6536/1 (Submariner)	112,256	Q4 1955 caseback "4 55", Jubilee bracelet stamped 1960	1955	Sotheby's 2021 lot 35
6536/1	112,341	Red Depth, IV.55 caseback	1955	Bonhams Dec 2021 lot 36
6536/1	155,502	Q2 1956 caseback II.56, on 7206 rivet bracelet	1956	Phillips Geneva V 2017 lot 102
6536/1	229,640	I.57 caseback	1957	Sotheby's 2018 lot 215
6536 (parent)	306,706	gloss black gilt, red triangle bezel	March 1957	Bonhams London 2012 lot 116 (GBP 21,250)
6536/1	306,989	III.57 caseback, no-hash red triangle, glossy gilt — world record	1957	Sotheby's NY 2018 lot 252 (USD 225,000 — small-crown record)
6536	399,228	brown tropical dial	c.1959	Sotheby's London 2019 lot 121
6538 (Submariner)	140,300–140,500 (Series 1)	~200 watches per Blackbird Watch Manual	c.1956	Blackbird Biebuyck (2019)
6538	158,100–158,400 (Series 2)	four-line OCC dial concentration	c.1957–58	Blackbird Biebuyck (2019)
6538	307,100–307,600 (Series 3)	two-line gilt	1958	Blackbird Biebuyck (2019)
6538	426,000–449,300 (Series 4)	late-run, fourth series	late 1958 / 1959	Blackbird; Sotheby's Olmsted 2024 lot 170 case 449,004
5510 (Submariner big crown)	362,153	RAN MilSub Explorer dial, fixed lugs (~4 known)	1958	Sotheby's Important Watches 2023 lot 107
5510	362,187	reprinted Explorer dial RAN	1958	Antiquorum Monaco 2018 lot 314-248
5510	362,252	Royal Navy diver provenance, RN log, 9315/580 bracelet	1958	Bonhams 16805/140
5508 (Submariner small crown)	361,650	black gilt, red triangle insert	1958	Phillips Geneva NINE 2019 lot 213 (CHF 500,000)
5508	400,505	tropical dial, 1960 papers	1958	Sotheby's Fine Watches 2023 lot 40
5508	489,831	small-crown James Bond catalogue	1959	Sotheby's Watches Online 2020
5508	490,575	ghost bezel, rivet bracelet '63	1958	Antiquorum Geneva 2020 lot 333-422 (CHF 56,250)
5508	762,896	exclamation gilt, II.62 caseback, 7206/64 bracelet	1962	Phillips Hong Kong SPORTS 2019 lot 881 (HKD 2,687,500)
5508	764,524	exclamation, 6636 clasp 4/64	1962	Phillips Geneva XV 2022 lot 160 (CHF 132,300)
6098 (Pre-Explorer / Oyster Perpetual)	912,378	steel + Sesto Continente "Super Oyster" provenance, IV.52 caseback	Q4 1952	Vailati 1953 letter to Rolex Archives (Perezcope)
6150 (Pre-Explorer)	931,134	H.S.10 CD Royal Navy with crow's foot	c.1953	Sotheby's Fine Watches 2025 L25713
6150	944,811	H.S.10 CD, Burford matte-black Swiss T Precision printing, MOD broad-arrow	February 1953	Bonhams 18849/181 (GBP 8,400 incl. premium)
6150	944,925	"Oyster Perpetual Precision" dial	1953	Antiquorum Geneva 2022 lot 349-152
6150	945,021	"KANGCHENJUNGA 1955 G.C BAND" caseback engraving	1953 case, 1955 expedition gift	Phillips Geneva Watch Auction SIX 2017 lot 244 (CHF 200,000)
6150	945,096	A296 18j, Oyster expandable bracelet	c.1953	Sotheby's 2022 / 2024 (same example reoffered)
6350 (Explorer chronometer)	955,190 (low) → 955,948 (high)	A296 chronometer-rated, 3-6-9 chapter ring "Explorer" + OCC, ~760-unit numerical span	1953–55	Collectors Square aggregate; tight single-batch run
6350	955,761	Sir Douglas Prior 1956 Royal Society Antarctic Expedition, Cal. 775 service replacement	1953 case	Antiquorum Geneva 2018 lot 317-570 (CHF 62,500)
6610 (Explorer second-gen)	113,092 → 360,272+	Cal. 1030 25j COSC, gilt chapter-ring; red-depth concentrates in 113,xxx first-year batch	1955–59 active, leftover stock to 1963	Phillips Geneva 8 lot 95; Phillips Watch Auction One lot 167; Antiquorum lot 368-493
5514 (Submariner COMEX)	2,833,552	5513 COMEX HEV Prototype No. 24	autumn 1970	Antiquorum Geneva 2006 lot 144-323 (CHF 76,700) — pre-5514 5513-COMEX-HEV anchor
5514	3,804,841	prototype-batch ~20 pieces, no COMEX logo on dial — "stealth" early 5514	1972	Antiquorum NY 2009 lot 223-373 (USD 72,000)
5514	4,089,919	COMEX 377, matte black, 9315 bracelet, Henry Hudson letter	1975	Phillips NY Watch Auction SIX 2022 lot 153 (USD 252,000 — record)
5514	4,155,901	COMEX 446, "Cuerpo Infanteria" Argentine Navy / COMEX joint variant	1974	Phillips Geneva 2015 lot CH080215/145
5514	5,230,258	COMEX 878, "Big Numbers" wrap-around caseback	1977	Antiquorum Monaco 2025 lot 383-172 (EUR 91,840)
5517 (MilSub, Royal Navy / Army)	~3,926,000 cluster (Batches 1–2)	5513-only and 5513/5517 double-reference; issue years 77/79	1972–1975	Phillips New York 2019 lot 28 case 3,926,768; Phillips HK 2017 lot 807 case 3,926,923; Antiquorum Monaco 2022 lot 77 case 3,926,842
5517	~5,339,000 cluster (Batch 3)	5517-only between-lugs engraving, sword hands, full 60-min bezel; issue year 78	1977–1978	Phillips Geneva XIV 2021 lot 152 case 5,339,827 (CHF 504,000 — record); Sotheby's 2023 lot 3 case 5,339,705 issue 853/78 (CHF 482,600)
16760 (GMT-Master II Fat Lady)	8,463,283	Coke bezel, cal. 3085 27j, "Fat Lady" attribution	c.1984	Sotheby's Important Watches HK 2021 lot 2004
16760	R275863	Coke, mvt 1994435, 78790 service-replacement bracelet	c.1988	Bonhams Knightsbridge 2023 lot 28031/167
16760	R434190	full set with Merksamer Jewelers guarantee, mvt 2102621	c.1988	Phillips Geneva Watch Auction X 2019 lot 149 (CHF 20,000)
16700 (Last caller GMT-Master)	R-serial	1988 Pepsi, 78360 / RS11 clasp	1988	Bonhams 25956/4
16700	T254282	1996 Pepsi delivered Dec 1996, full set with Beyer receipt	1996	Antiquorum Geneva 2020 lot 329-88 (CHF 11,875)
16700	T848499	c.1996 Pepsi, with extra black bezel, cal. 3175	1996	Sotheby's Geneva Important Watches 2019 lot 10
16700	W752611	c.1995 Pepsi, faded bezel, tritium dial	1995	Sotheby's Fine Watches Online 2024 lot 417
16700	U443556	1997 Chuck Yeager / Real McCoy's No. 14/50, Bell X-1 1947 caseback	1997	Bonhams 25232/969 (HKD 106,250 incl. premium)
16700	U453541	c.1997 Chuck Yeager / Real McCoy's No. 21/50	1997	Phillips Hong Kong XI 2020 lot 862
16700	A245609	c.1999 Chuck Yeager / Real McCoy's	1999	Sotheby's Hong Kong 2019 lot 2023

The pattern: vintage Submariner case-number bands are tighter than the year-band serial tables suggest. The 6204 dominant cluster sits in the 988,xxx range (1953–54); the 6205 splits cleanly between the post-reset 21,3xx–21,6xx (Series 1, 1954) and 85,9xx–86,0xx (Series 2, 1955); the 5510 clusters in 362,xxx (1958); the 6536 / 6536-1 cluster spans 112,xxx through 399,xxx across 1955–59. The Roman-quarter caseback stamp inside the case is the cleanest single dating anchor for any 1953–62 Submariner / Explorer head — pair the case number with the Roman-quarter stamp before relying on the case number alone.

Cross-referencing for full dating

Serial alone gets the watch into a year band. The rest of the watch has to agree. Clasp dates the bracelet, not the case. Bracelet reference, dial generation, and movement all narrow the year independently. When those signals disagree, the serial still dates the case, but not necessarily the full watch as worn.

A U-serial 16610 with SEL bracelet, Luminova dial, and cal 3135 reads cleanly as a 1997–1998 watch. A U-serial 16610 on an older 93150 bracelet still dates the case to the same period, but it no longer reads as a period-correct full watch.

Per-family serial chart links

The decoder above gets the year band. The individual reference pages carry the detailed tables. The 16520 remains the clearest letter-by-letter example, and the manual-wind Daytonas sit on Pergola-based numeric ranges. For everything else, the relevant reference page is the right place to look.

The Air-King 5500 is the longest-running single Rolex reference at 32 years (1957 to 1989). Its case-number band spans roughly 365,000 (early 1958) through to the late seven-million range (1985 to 1989) — covering the full numeric-serial era and crossing into the early letter serials toward the end. Inside-caseback Roman-quarter date stamps (II.65, III.71, IV.83, etc.) are the cleaner per-watch dating tell on a 5500 since the case-number band overlaps with much of the broader Oyster Perpetual / Datejust production. Caseback inside stamps frequently read "1002" rather than "5500" on 1970s-onward production — period-correct, since the 5500 shares its case middle with the 1002 Oyster Perpetual.

Sources

• RolexHaven — Serial Numbers (Pergola + Dowling charts)
• Dowling, J.M. and Hess, J.P., The Best of Time: Rolex Wristwatches (1996, revised editions through the 2010s). Schiffer Publishing.
• Pergola, C., Rolex Daytona, A Legend Is Born.
• Boettcher (vintagewatchstraps.com) — case-serial methodology and the parallel clasp date-code system.
• Millenary Watches — Rolex Bracelet and Clasp Codes — clasp date-code key A=1976 → CP=2011 plus the post-2011 randomization note.
• The Vintage Rolex Field Manual — Colin A. White, Morning Tundra
• Sotheby's catalog records for case-anchored letter-year boundaries on 116528 (P421022 = 2000, Y'239'786 = 2002).