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. The case had no crown guards, the 24-hour bezel was moulded from bakelite and cracked easily, and a gold branch with alpha hands ran alongside the red-and-blue (Pepsi) 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 1	k YG Bakelite Peps	(steel), bakelite	rown (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 bezel insert (replacing the fragile bakelite) and a twenty-year production run long enough to hold several distinct watches under one number. Early pointed crown guards, known as PCG, gave way to rounded guards; gilt dials gave way to matte; and the steel watch was joined by a gold branch and a two-tone Root Beer branch.

Reference	Production	Movement	Case	Branches	Key distinction
1675 1959–1979 1565 early, 1575 lat	r 40mm SS,	18k YG, or two-tone St	el, 1675/8 gold, 1675/3 Root B	er Core vintage GMT-Master; PCG to r	unded 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 added a quick-set date and a higher beat rate but kept the older linked-hand GMT logic, in which the 24-hour hand tracks the local hour hand rather than moving on its own. Acrylic crystals held through most of the run. The branch map also gets busier here, 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	epsi, black, spide	Last steel GMT-Master with acrylic	rystal; quick-set date
16753 1979–1988 3075 40mm SS + 1	k YG Brown	Root Beer,	black	Two-tone continuation of the Root B	er line
16758 1979–1988 3075 40mm 18k YG	Brown	Root Beer,	black	Last gold GMT-Master with older lin	ed-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 a second-time-zone aid. The thick transitional 16760 gave way to the slimmer 16710 in 1989, and the line spent nearly two decades on that reference 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” / ”	ophia Loren”
16710 1989–2007 3185, late 3186 40mm	SS	Pepsi, Coke, bla	k	Long neo-vintage steel run; late st	ck-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-docum	nted, brown thinne	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. The 16700 kept the older linked-hand GMT logic rather than adopting the independent hour hand of the GMT-Master II references it ran in parallel with, which is the mechanical distinction that kept the two lines separate right to the end.

Reference	Production	Movement	Case	Branches	Key distinction
16700 1988–1998/1999 3175 40mm S	Pepsi, black	Last GMT-M	ster; tri	ium to Luminov	transition

Movement progression

Caliber	Frequency	Hacking / quick-set	Used in	Notes
1036 / 1065 / 1066	18,000 vph	no / no	6542 Earliest GMT-specific movements;	icture 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; sometime	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 loca	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. The red-and-blue Pepsi bezel starts with the steel 6542 and has stayed the default visual identity of the line ever since. The brown-and-gold Root Beer bezel begins on the two-tone 1675/3 and gold 1675/8 in the early 1970s, then carries forward into the 16753, 16758, 16713, and the brown side of the 16718. The red-and-black Coke bezel arrives with the first GMT-Master II, the 16760, and stays associated mainly with that reference and the 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, and a watch that wears period parts correctly today may never have left the factory that way. Bracelet dates date the bracelet, not the watch head. Service inserts are common on every reference and nearly universal on the earliest ones, where the bakelite originals rarely survived. Nickname language is useful shorthand, but Pepsi, Coke, Root Beer, and plain black each cover a range of dial and bezel variants, and the labels can flatten real differences if used too loosely.

Modern ceramic references — 116710, 126710, 116718, 126715 — are not in this first upload tranche. The hub covers 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