Swiss gold, diamond, sapphire skeletonized watch Circa 1980

Skeletonized keyless lever dress watch
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A very fine Swiss, 18K yellow gold sapphire and diamond, skeletonized, keyless dress watch by  Audemars Piguet, Genève, circa 1980. Accompanied by a fitted box.  Diamond and sapphire set, shaped bezel and bow, glazed on both sides. Transparent dial, blued steel Feuille hands. Gilt brass movement, skeletonized and hand engraved, 20 jewels, straight line lever escapement, monometallic balance, adjusted for heat, cold, isochronism and five positions, shock absorber, self compensating Breguet balance spring. Case and movement signed.
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Diameter: 47 mm
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Signed: Audemars Piguet  Genève