Swiss gold perpetual calendar with moon phases Circa 1952

Complicated watch by Audemars Piguet
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A fine and rare Swiss 18 carat gold open faced perpetual calendar keyless lever watch with moon phases, circa 1952. Nickel finished lever movement, 19 jewels, bimetallic compensation balance. Two tone silvered dial with applied Arabic numerals, four subsidiary dials for month and leap year, day, month, constant seconds with lunar calendar and moon phases. Plain case, inlaid black enamel Roman numerals to the bezel, snap on back. Case, dial and movement signed.
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Diameter: 45 mm
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Signed: Audemars Piguet Genève