Unusual Swiss gold and black onyx dress watch Circa 1968

Lever dress watch by Audemars Piguet made for Cartier
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An unusual Swiss 18 carat gold and black onyx open faced keyless lever dress watch, circa 1968. Nickel finished lever movement, 17 jewels. Silvered matte dial, applied baton numerals. Plain case, enlarged black onyx bezel, gold snap on back. Case signed by watchmaker, numbered by retailer and stamped ‘EJ’ for Edmond Jaeger, dial signed by retailer, movement signed by watchmaker.
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Diameter: 42 mm
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Signed: Audemars Piguet & Co – Cartier