This is a Mk 1 GMT Master, model number 6542, case number 32630XX made in the last quarter of 1956 and sold in Hong Kong in October two years later.
These early GMT s have become very desirable in the last few years and this is an especially nice one. The movement is a calibre 1035 with Kif Flector shock protection and bears the serial number DN680382. The movement is timed to 5 positions and has 25 jewels.
The dial is gloss black paint, which has now gone matt and the gilt writing is perfect and the dial is signed “Officially Certified Chronometer” not the more common “Superlative Chronometer Officially Certified” as used nowadays. The original radium luminous has faded to a lovely coffee colour, but obviously no longer glows. It retains its original hands, including the rare ‘small triangle’ red 24 hour hand.
It retains both the original bezel and its acrylic insert, the insert is in the best condition of any that I have seen, with no cracks or loss of the luminous infill.
The inside case back has a number of service marks from Rolex USA.
The case is 95%, the movement is also 95% and the dial is in 90+% condition.
The watch measures 38mm diam., 46mm lug to lug, 12mm high; it takes a 20mm strap and a replacement light US Rolex Oyster band is fitted to the watch
£44,000.00 (approx. $55,200.00 US)