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This is a superb Omega dress watch in an 18 carat gold case, which dates from 1952. The gold case was made by Dennison, so the movement and dial were imported and the watch watch was made up here in England (I assume to avoid payment of import duty). There’s a very interesting introduction to Dennison cased Omegas here:

The watch is chronometer rated, which means it passed a series of tests at the Geneva Observatory to verify the precision of the timekeeping across a range of positions and at different temperatures. This doesn’t mean that this model of watch passed the test, but that this actual watch movement was subject to the exhaustive trials: The trials were held over a period of forty-five days and featured ten separate timekeeping tests in five different positions and two temperatures. At the end of the trial if the watch kept time within certain parameters then it was allowed to be marked as a ‘chronometer’.

The dial of this watch is exceptional - bold, applied arabic numerals and a wonderful light patina. The movement is a manual wind calibre 283 with sweep seconds. The watch comes with a 9 carat gold Omega buckle, which I believe is original to the watch and a new old stock genuine alligator strap.

Manual wind Omega chronometers are really rather rare and Dennison cased ones, even more so. All in all an exceptional watch in wonderful condition and ready to be worn and enjoyed. The watch has been fully serviced and regulated and the time keeping is of the highest order.

Case diameter (excluding winding crown): 38mm
Case material: 18 carat gold, hallmarked Birmingham 1952
strap width: 19mm
time keeping: grade A