Swiss 18 carat gold open faced lever pocket watch Circa 1970

Gold keyless watch
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A Swiss 18 carat gold open faced keyless pocket watch made by Patek Philippe in Geneva, circa 1970. Retailed by Hausmann & Co. The lever movement with 18 jewels. Silvered dial with baton hour indexes, Roman 12 o’clock and gold hands. The plain brushed case with a snap-on back. Dial signed by the retailer and watchmaker, case numbered and signed by the watchmaker.
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Diameter: 42 mm
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Signed: Patek Philippe Genève
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Reference 855/1.