Swiss 18k gold open faced keyless lever dress watch Circa 1968

Gold keyless lever dress watch by Patek Philippe
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A fine and rare Swiss 18 carat gold open faced keyless lever dress watch, circa 1968. Mechanical movement stamped twice with the Geneva seal, 18 jewels. Engine turned silvered dial, applied gold square and baton numerals, gold dauphine hands, outer dot minute divisions on plain chapter ring and subsidiary seconds. Case with ribbed bezel, engine turned snap on back with ribbed rim. Case, dial and movement signed, case and movement numbered.
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Diameter: 44 mm
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Signed: Patek Philippe Genève