Thin Swiss 18K gold complicated lever dress watch Circa 1985

Gold lever dress watch with perpetual calendar and moon phases 
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A very fine Swiss 18-carat gold keyless lever dress watch with perpetual calendar and moon phases, made in the 1980s. Rhodium-plated movement, Geneva stripes decoration, 20 jewels, straight-line lever escapement, mono-metallic balance with shock absorber suspension, adjusted to heat, cold, isochronism and five positions, self-compensating Breguet balance spring. White enamel dial with painted Roman numerals, subsidiary dials for days of the week, months of the leap year cycle, date, moon phase aperture with ages of the moon on the edge and original blued steel cathédrale hands. Brushed and polished case, rounded band, stepped bezel, cabochon sapphire set winding crown. Dial, case and movement signed, case numbered. Accompanied by a fitted box.
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Diameter: 47 mm
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Signed: Audemars Piguet & Cie Brassus, Swiss