Extremely fine and rare Swiss complicated watch Circa 1972

Gold open faced complicated watch by Audemars Piguet
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An extremely fine, rare and slim Swiss 18 carat gold open faced minute repeating perpetual calendar split seconds chronograph keyless lever watch with moon phases, circa 1972. Nickel finished lever movement, 36 jewels, bimetallic compensation balance, micrometer regulator, minute repeating on two polished steel hammers onto a gong. Silvered dial, applied baton numerals, outer Arabic five minute divisions, four subsidiary dials for month and leap year indicator, day, date, constant seconds and moon phases. Plain circular case, stepped bezel, repeating slide in the band, snap on back, split seconds chronograph mechanism operated through a button in the band and through the crown. Case, dial and movement signed.
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Diameter: 48.5 mm
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Signed: Audemars Piguet