Skeletonized perpetual calendar with moon phases Circa 1990

Gold, diamond set skeletonized complicated watch by Audemars Piguet
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A rare Swiss 18 carat gold and diamond set skeletonized open faced keyless lever pocket watch with perpetual calendar and moon phases, circa 1990. Calibre 5020, gilt and nickel finished fully skeletonized lever movement engraved with scrolls, mono-metallic compensation balance. Gilt outer chapter ring with Roman numerals, three subdials for date, day, leap year, month calendar, sector for age and phases of the moon. Case with sapphire crystal back and diamond set bezel. Case, dial and movement signed.
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Diameter: 49 mm
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Signed: Audemars Piguet Swiss made Quantiem Perpetual