Thin Swiss 18K gold complicated lever dress watch Circa 1985

Gold keyless lever watch with complications by Audemars Piguet
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A very fine, rare, ultra-thin Swiss 18-carat gold keyless lever dress watch with perpetual calendar, moon phases and lunar calendar, made in the 1980s. Rhodium-plated movement, Geneva striping and oeil-de-perdrix decoration, 20 jewels, straight-line lever escapement, mono-metallic balance adjusted to heat, cold, isochronism and five positions, self-compensating flat balance spring, shock absorber. White enamel dial with painted Roman numerals, outer minute track, subsidiary dials for the months and four-year cycle, days of the week and date, aperture for the moon phases with lunar calendar and original blued steel cathedral hands. Polished and brushed case, stepped curved bezel, brushed band, hinged bow, cabochon sapphire set winding crown, sapphire crystal. Dial, case and movement signed, case and movement numbered.
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Diameter: 47 mm
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Thickness: 8 mm
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Signed: Audemars Piguet Swiss