Swiss silver key less wind open face pocket watch Circa 1918

Rare and very fine precision pocket watch
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A Swiss original silver case, punched PD, matching numbers on the movement, circa 1918.
Prime quality anker chronometer, inscribed COMPENSATEUR GUILLAUME, bridge is signed. The enamel dial are original and signed.
With subsidiary seconds  and blued steel hands, dial with fine hairlines, all together in very beautiful condition,
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Diameter: 55 mm
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Weight: 125 g
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Signed: Paul Ditisheim   Chaux De Fonds