Fine and rare Swiss 18k gold complicated watch Circa 1967

Gold open faced complicated watch by Patek Philippe
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A fine and rare Swiss 18 carat gold open faced minute repeating split seconds chronograph keyless lever with perpetual calendar and moon phases, circa 1967. Nickel finished lever movement, 42 jewels, bimetallic compensation balance, swan neck regulator, minute repeating on two gongs activated by a slide in the band. Matte silvered dial, applied baton numerals, four subsidiary dials for day, month, date combined with 30 minute register, constant seconds combined with phases of the moon. Heavy polished case, raised bezel, split seconds chronograph buttons in the band and crown. Case, dial and movement signed.
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Diameter: 57 mm
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Signed: Patek Philippe Genève