Rolex Prince

A checked version of this page, approved on 9 August 2026, was based on this revision.

The Rolex Prince is the rectangular Art-Deco family that ran from the 1928 launch into the mid-1940s. It was Rolex's bid for the men's chronometer market, built around an Aegler-patented (1927) shaped movement that placed the winding barrel at one end of the case and the balance at the other. The dial layout that defined the line is the duo-dial, hours and minutes in the upper register and sub-seconds at six, two visually separated tracks on the same plate. Marketing sold the Prince as "the watch for men of distinction", the exact wording of a 1930 advertisement reproduced in Jake Ehrlich's Rolex Magazine history of the line. The chronometer-grade movement made the claim defensible.

Seven catalog references carry the Prince name through the vintage era: 971 (the original Brancard), 1490 (the canonical larger Brancard), 1491 (a Brancard sibling), 1527, 1862, 3361, and 3937, with the unflared 1343 Classic alongside them. Production tapered through WWII as Rolex consolidated around the Oyster Perpetual platform; the latest documented Prince case carries a 1947 caseback dedication. The Prince does not return to the Rolex catalog until the 2005 Cellini Prince revival, a different platform and a different watch.

Common entry points

Identifying a Brancard?
1490 — the canonical Brancard. Larger flared stretcher case, Cal 300 / 350 / T.S. 300 across the run, documented examples in steel, 9K through 18K gold, pink gold, two-tone, Tiger Stripe, and a single platinum.

Researching the earliest Prince?
971 — the original Brancard. Friedberg's 2001 Timezone article assigns the nickname here — the earliest version of the flared stretcher case, c.1928, the reference the 1490 evolves from.

Cross-checking a non-Brancard Prince?
1343 — the Prince Classic. The unflared sister to the Brancards, suffix system A and B for metal and dial branches, and one of the two candidates (with 971 or 1490) for the 1928 launch pair.

References

The active-scope Prince references covered on this wiki:

Reference	Production	Case shape	Movement family	Key distinction
1343	c.1928/1929–c.1935	Unflared rectangular Classic	Aegler 7½ ligne shaped, 15j Observatory Quality	The Prince Classic; the unflared sister to the 971/1490 Brancards. Suffix system: 1343 (silver), 1343A (standard, multiple metals), 1343B (Tiger Stripe two-colour gold). Friedberg reads 1343 + 971 as the 1928 launch pair; Rolex Magazine 2017 reads 1343 + 1490
971	c.1928–early 1930s	Early Brancard "stretcher"	Aegler shaped (early variants)	The original Brancard; Friedberg's 2001 Timezone article assigns the Brancard nickname here, while modern auction-house convention has shifted the nickname to the 1490
1490	c.1928–c.1945	Larger flared Brancard, ~36–37×22–23mm body	Cal. 300 / Cal. 350 / Cal. 7¾′′′ T.S. 300	The canonical Brancard; the most heavily catalogued Prince reference, with documented examples in steel, 9K/10K/14K/18K gold, pink gold, two-tone, Tiger Stripe bi-color, and a single platinum example (Bonhams 2017, GBP 32,500)
1491	c.1930s	Brancard sibling	Aegler shaped	Brancard variant, smaller production
1527	c.1930s	Rectangular	Aegler shaped	Prince variant
1862	c.1930s–1940s	Rectangular	Aegler shaped	Prince variant; surfaces alongside the 1490 in Christie's group lot 1395-307 (18K, case 16,663, c.1938)
3361	c.1930s–1940s	Rectangular	Aegler shaped	Late Prince variant
3937	c.1930s–1940s	Rectangular	Aegler shaped	Late Prince variant

The Brancard nickname

A naming dispute runs through the literature. The auction houses are unanimous in calling the 1490 a Brancard, and the word sits in the catalog title of every major house that has sold one. Editorial sources are split. Michael Friedberg's 2001 TimeZone article assigns the Brancard name specifically to the earlier reference 971 and treats the 1490 as a separate, larger Prince. Andres Ibarguen's 2021 doctor's-watch piece for Coronet Magazine follows Friedberg.

The two readings reconcile without much strain. 971 was the first Brancard, the earliest version of the flared stretcher case, and the 1490 is the larger evolution of the same shape; both qualify by their flared profile. Modern auction-catalog convention treats the 1490 as the headline Brancard reference, and that convention dominates collector search. The reference number is unambiguous; the nickname is contested.

Movement family

The Prince runs on Aegler shaped movements built in Bienne under Hans Wilsdorf's exclusive supply arrangement. That arrangement stayed a supplier contract for the whole life of the line and long after it. Rolex did not buy Aegler outright from the Borer family until April 2004, as Tim Mosso set out for Quill & Pad.

Three calibers carry the family. Cal. 300 is the base Prince movement, 15 jewels at 18,000 vph with about 50 hours of power reserve, produced 1928 to 1937. It is architecturally identical to the Gruen Cal. 877 of the Gruen Techni-Quadron, a sibling from the same Aegler family sold under another brand, and some early Prince literature carries the confusion across and lists "Cal. 877" for the Rolex. Oren Hartov's Analog/Shift history of the doctor's watch traces that misattribution to the Gruen sibling relationship; it does not belong in a canonical Prince caliber listing.

Cal. 350 also runs 15 jewels, 18 on some examples, and is documented on multiple 1490 examples catalogued at Phillips and Monaco Legend. The Cal. 7¾′′′ T.S. 300, Très Soigné, is the Ultra Prima movement — 18 jewels, lateral lever escapement, monometallic balance with micrometer regulator, Breguet overcoil hairspring, rhodium-plated and adjusted in six positions, produced 1932 to 1938.

Grading runs on a separate axis from caliber number. Aegler and Rolex applied a tiered finishing hierarchy across the Prince calibers, rising through Prima, Extra Prima, and Ultra Prima with each step adding regulation, hand-finishing, and chronometer testing. The "Chronometer" or "Observatory" dial designation belongs to the Extra Prima and Ultra Prima grades; a Prima-grade movement does not earn the dial mark.

The Kew-Teddington observatory testing tradition runs through the Prince era. Rolex submitted Prince movements to the National Physical Laboratory at Kew for independent rate certificates separate from the Swiss Bureaux Officiels Suisse de Contrôle. Kew ran a 45-day protocol against the Swiss bureau's 15 days, and James Dowling, co-author with Jeffrey Hess of The Best of Time: Rolex Wristwatches, has cited Rolex pass rates of 136 out of 145 Class A submissions in the 1940s and 1950s. The 1914 Class A Kew certificate that Rolex commonly cites as its first official chronometer rating was issued for an earlier ladies' wristwatch movement, so that milestone predates the family. The Prince calibers carry the observatory-testing lineage forward from 1928.

Related families

Bubbleback — the parallel Oyster line. The same 1928–1948 window, same Aegler-supplier relationship, same Wilsdorf catalogue. Different case shape, different brief.
Air-King — the post-war successor. The 1945 4925 / 4365 / 4499 originating Air-Kings open the line that effectively replaces the Prince in the catalogue.

Shared references

Serial numbers by year — Rolex serial conventions across the Prince era, including the Glasgow and London assay date letters that often pin a 9K example to a single year
Movement reference — the Aegler shaped-movement family (Cal. 300, Cal. 350, Cal. 7¾′′′ T.S. 300) and the Prima / Extra Prima / Ultra Prima grading tiers
Bracelet & clasp guide — bracelet types, end-links, and clasp date codes