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Rolex GMT-Master Mark 0.5, ref. 1675, 1966 — view 1 of 6
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Wristwatches · Wristwatch

Rolex GMT-Master Mark 0.5, ref. 1675, 1966

DocumentedDocumented from a dealer's listing; attribution and date as stated by the dealer.
Maker / attribution
Rolex (maker)
Date
1966
Country of origin
Switzerland
Object type
Wristwatch
Materials / technique
Stainless Steel
Stock no.
GMT39
Credit line
Dealer listing, Watches of Knightsbridge (GMT39)
Catalogue title (original)
1966 Rolex GMT-Master 1675 Mark 0.5 (English)

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Record summary

Catalogued by Watches of Knightsbridge (dealer), London (stock number GMT39), this is a wristwatch by Rolex, made in Switzerland, dated 1966. The Atlas places it in the Modern Mechanical Horology period (1945 – 1969) of its Wristwatches collection. Materials and techniques recorded by the source: Stainless Steel. The record is illustrated with 6 photographs.

Assembled from the source record's structured fields. Dates and attributions are given as the source states them; where a field is missing the Atlas leaves it blank rather than estimating.

Catalogue description

Dealer description — Watches of Knightsbridge

1960s Rolex GMT-Master featuring a rare early Mark 0.5 matte dial with stringy coronet, small red arrow-tipped 24hr hand and beautifully aged “Pepsi” 24-hour bezel (red back).

Specifications — Watches of Knightsbridge

Reference: 1675; Metal: Stainless Steel; Movement: Automatic

Historical context

Modern Mechanical Horology (1945 – 1969)

Tool watches for divers, pilots and astronauts; electric watches anticipate the electronic age.

The classic era of the mechanical wristwatch: dive watches, chronographs for motor racing and space flight, GMT watches for jet travel, slim dress watches, automatic calendars, and the rise of Japanese manufacturers alongside Swiss, American, German and Soviet industries.

Read the period in the timelineMore wristwatches from this periodEarlier: Golden Age of Mechanical Watchmaking

Atlas type guide

Military, pilot and travel watches

The wristwatch owes much of its adoption by men to warfare and aviation. Wristlets — small pocket watches soldered with lugs and worn on a strap — were used in colonial campaigns and became standard equipment in the First World War, with protective grilles over the crystal ('shrapnel guards'). Louis Cartier's Santos (1904), designed for the aviator Alberto Santos-Dumont, is often cited as an early purpose-made pilot's watch.

In the Second World War governments specified watches in detail: the German B-Uhr observation watches, the American A-11, and the British 'W.W.W.' (the 'Dirty Dozen' set of 1945). After the war, jet travel brought GMT and world-time watches, which show two or more time zones at once — Louis Cottier's world-time mechanism and the Rolex GMT-Master (1955) are examples.

What to look for

  • Military markings on the case back: broad arrow, issue numbers, 'W.W.W.', 'A.T.P.'
  • High-legibility black dials with luminous Arabic numerals; oversized crowns for gloved hands.
  • 24-hour hands and rotating 24-hour bezels or city rings on GMT/world-time watches.
  • Wire lugs on early wristlets converted from pocket watches.

Dating clues

  • Wire-lug wristlets: c. 1900–1925.
  • Military specifications of the Second World War: 1939–1945.
  • GMT and world-time wristwatches: mainly after 1950.

General guidance written by the Atlas editors about this kind of object. It is not a statement about this particular piece; for that, rely on the source record above and on physical examination.

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