Swiss perpetual calendar watch with moon phases Circa 1949

Gold open faced lever complicated watch by Patek Philippe
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A fine and rare Swiss 18 carat gold open faced keyless lever perpetual calendar watch with moon phases, circa 1949. Nickel finished lever movement, 18 jewels, bi- metallic compensation balance. Silvered matte dial, applied gold Arabic numerals, four subsidiary dials for month and leap year indicator, day, date and moon phases and constant seconds. Plain case, snap on back. Case, dial and movement signed.
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Diameter: 46 mm
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Signed: Patek Philippe Genève