Swiss white gold watch diamond set and skeletonized Circa 1986

Complicated lever dress watch by Audemars Piguet
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An extremely fine, very rare and attractive Swiss 18 carat white gold and diamond set skeletonized keyless lever dress watch with perpetual calendar and moon phases, circa 1986. Sold to the Sultanate of Oman. Calibre 5020/2820, skeletonized, rhodium finished hand engraved movement, 21 jewels, mono-metallic balance, self compensating flat balance spring, shock absorbers. Annular brushed white gold chapter ring with Roman numerals, inner crystal plate with dark blue annular minute ring, subsidiary dials for the date, days of the week, months with leap year indication, moon phases and lunar calendar, blued steel cathedrale hands. Case glazed on both sides, bezel set with 62 brilliant cut diamonds, cabochon sapphire set crown, hinged bow, correctors in the band. Case, dial and movement signed.
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Diameter: 49 mm
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Signed: Audemars Piguet Quantieme Perpetuel