Swiss gold open faced keyless pocket watch Circa 1910

Pocket chronometer by Omega
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A Swiss gold pocket chronometer with original box, circa 1910.
The case of this watch is 18 carat gold and the white signed dial consists a subsidiary dial for the seconds and blue hands. It has a 3/4 plate movement with a gold screw compensation balance and a cam type fine adjusting device.
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Diameter: 51 mm
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Weight: 89 g
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Signed: Omega “Chronomètre”