Reference:gmt-master

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The first watch Rolex ever built for airline pilots, and one of its most copied designs since. Launched in 1955 for Pan Am flight crews, the GMT-Master carries a fourth hand and a 24-hour bezel so the wearer can track two time zones at once. Bakelite turned to aluminum, steel split from gold and two-tone, and the GMT-Master became the GMT-Master II when the local hour hand learned to move on its own. Color branches — Pepsi, Root Beer, Coke, black — ended up carrying as much collector weight as the reference numbers themselves.

Early GMT-Master (1955–1959)

The experimental years. No crown guards, a bakelite 24-hour bezel that cracked easily, and an alpha-handed gold branch alongside the red-and-blue steel watch. Most surviving examples carry later service inserts because the original bakelite was fragile enough to rarely survive daily wear.

Reference	Production	Movement	Case	Bezel	Key distinction
6542	1955–1959	1036 / 1065 / 1066	38mm SS or 18k YG	Bakelite Pepsi (steel), bakelite brown (gold)	First GMT-Master; no crown guards; fragile bakelite insert

Long vintage core (1959–1980)

The reference that turned the GMT-Master from an experiment into an institution. Crown guards arrived with the 1675, along with an aluminum insert and a 20-year production run long enough to hold several distinct watches under one number. Early pointed crown guards give way to rounded guards, gilt dials give way to matte, and a gold branch and two-tone Root Beer branch develop alongside the steel watch.

Reference	Production	Movement	Case	Branches	Key distinction
1675	1959–1979	1565 early, 1575 later	40mm SS, 18k YG, or two-tone	Steel, 1675/8 gold, 1675/3 Root Beer	Core vintage GMT-Master; PCG to rounded guards, gilt to matte

Transitional GMT-Master (1979–1988)

The five-digit quick-set era on the GMT-Master side of the family split. Caliber 3075 adds quick-set date and a higher beat rate, but keeps the older linked-hand GMT logic. Acrylic crystal holds through most of the run. This is also where the line’s branch map gets busier, with steel, two-tone, and solid-gold references all in production at once.

Reference	Production	Movement	Case	Branches	Key distinction
16750	1979–1988	3075	40mm SS	Matte to glossy Pepsi, black, spider	Last steel GMT-Master with acrylic crystal; quick-set date
16753	1979–1988	3075	40mm SS + 18k YG	Brown Root Beer, black	Two-tone continuation of the Root Beer line
16758	1979–1988	3075	40mm 18k YG	Brown Root Beer, black	Last gold GMT-Master with older linked-hand logic

GMT-Master II (1982–2007)

The functional break in the family. Caliber 3085 in the 16760 introduced an independently adjustable local hour hand, which turned the 24-hour bezel into a third-time-zone tool rather than just a second-time-zone aid. The thick transitional 16760 gave way to the slimmer 16710 in 1989, and the line spent nearly two decades there before the ceramic era rewrote the watch.

Reference	Production	Movement	Case	Branches	Key distinction
16760	1983–1987	3085	40mm SS (thick)	Coke, black	First GMT-Master II; “Fat Lady” / “Sophia Loren”
16710	1989–2007	3185, late 3186	40mm SS	Pepsi, Coke, black	Long neo-vintage steel run; late stick-dial 3186 sub-branch
16713	1989–2007	3185, late 3186	40mm SS + 18k YG	Brown, black	Two-tone GMT-Master II branch
16718	1989–2007	3185, late 3186	40mm 18k YG	Black well-documented, brown thinner	Solid-gold GMT-Master II branch

Late GMT-Master (1988–1999)

The last reference on the original side of the family split. Sapphire crystal, caliber 3175, and a choice of Pepsi or black bezel — but crucially, still the older linked-hand GMT logic rather than the independent flying hour hand of the GMT-Master II references it runs in parallel with.

Reference	Production	Movement	Case	Branches	Key distinction
16700	1988–1998/1999	3175	40mm SS	Pepsi, black	Last GMT-Master; tritium to Luminova transition

Movement progression

Caliber	Frequency	Hacking / quick-set	Used in	Notes
1036 / 1065 / 1066	18,000 vph	no / no	6542	Earliest GMT-specific movements; picture still unresolved
1565	18,000 vph	no / no	1675 (early)	First stable 1675 caliber
1575	19,800 vph	hacking from ~1971	1675 (late)	Long-run 1675 caliber; sometimes signed 1570
3075	28,800 vph	yes / yes	16750, 16753, 16758	Five-digit quick-set upgrade; still linked-hand GMT
3085	28,800 vph	yes / yes	16760	First independently adjustable local hour hand
3175	28,800 vph	yes / yes	16700	Last linked-hand GMT-Master caliber
3185	28,800 vph	yes / yes	16710, 16713, 16718	Long neo-vintage GMT-Master II movement
3186	28,800 vph	yes / yes	late 16710, 16713, 16718	Rare late Parachrom-era movement

Color and metal logic

Recurring branch identities run across the reference numbers and sometimes matter more than the digits themselves.

• Pepsi starts with the steel 6542 and remains the default visual identity of the line
• Root Beer begins with the two-tone and gold branch around 1675/3 and 1675/8, then carries forward into 16753, 16758, 16713, and the brown side of 16718
• Coke arrives with the first GMT-Master II and stays associated mainly with the 16760 and early 16710
• gold and two-tone GMT-Masters are part of the family from the earliest production onward, not a late luxury afterthought

Collecting context

The GMT-Master market rewards different habits than the Submariner market, even when the watches overlap in period. The Submariner collects around case shape, military use, and dial text. The GMT-Master collects just as much around bezel color, travel mythology, and branch identity.

The same caution comes up again and again across the family.

• original delivery is not the same thing as period-correct fitment
• bracelet dates do not date the watch head
• service inserts are common, especially on the earliest references
• nickname language is useful, but it can flatten real differences between black, brown, Pepsi, and Coke branches if you let it

Modern ceramic references (116710, 126710, 116718, 126715) are not in this first upload tranche yet. This hub is built around the vintage and neo-vintage references already in the research layer.

Sources

• In-Depth: The History of the Rolex GMT-Master and GMT-Master II — unknown, Monochrome
• The Rolex GMT-Master: A Complete Collector's Guide — Stephen Pulvirent, Sotheby's
• A Closer Look at the Rolex Root Beer — Christina Bohn, Sotheby's
• The Vintage Rolex Field Manual, Chevalier Edition — unknown, Morning Tundra