Swiss open faced chronometer pocket watch Circa 1912

Gold keyless wind chronometer pocket watch
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A gentleman’s very fine, rare pocket watch with 24h dial – CHRONOMETER – with Bulletin de 1ère classe de l’Observatoire de Genève, circa 1912.
An 18 carat gold case, engraved crest and crown, enamel dial, arabic numerals, subsidiary dial, bridge movement, Guillaume gold screw compensation balance.
This calibre took part in observatory tests and is not only extremely accurate, it is doubtlessly also one of the most beautiful movements ever created in Switzerland.
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Diameter: 52 mm
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Weight: 105 g
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Signed:   Longines  Genève