Swiss 18 carat gold open faced complicated watch Circa 1931

Fine and rare 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 and box, circa 1931. Nickel finished lever movement, 41 jewels, bimetallic compensation balance, micrometer regulator, repeating on two hammers onto two gongs. Silvered dial with applied gold Arabic numerals, outer railway minute divisions, four subsidiary dials for month and leap year, 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