Swiss 18 carat gold complicated lever watch Circa 1981

Gold open faced lever with perpetual calendar and moon phases 
–
A compicated Swiss 18 carat yellow gold open faced keyless watch with perpetual calendar and moon phases, circa 1981. Lever movement, 20 jewels, manual winding. White dial with Roman numerals, outer minute track, three subsidiary dials for day, date, month combined with leap year indication, fan form aperture for moon phases. Plain case with stepped bezel, cabochon sapphire winding crown. Case, dial and movement signed.
–
Diameter: 48 mm
–
Signed: Audemars Piguet Genève