Swiss 18k gold open faced complicated lever watch Circa 1950

Fine complicated watch by Patek Philippe
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A fine and rare Swiss 18 carat gold open faced minute repeating perpetual calendar split seconds chronograph keyless lever watch with moon phases, circa 1950. Nickel finished lever movement, 41 jewels, bimetallic compensation balance, micrometer regulator, repeating with two hammers onto two gongs. Silvered dial, applied gold Arabic numerals, outer railway minute divisions, four subsidiary dials for month, day, date, constant seconds and moon phases. Plain case, snap on back, repeating slide in the band, split seconds chronographs button in the crown and in the band. Case, dial and movement signed.
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Diameter: 50 mm
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Signed: Patek Philippe Genève