Swiss gold and diamond set lever mystery watch Circa 1970

Unusual watch with tiger’s eye dial by Piaget
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An unusual Swiss 18 carat gold and diamond set open faced keyless lever mystery watch, circa 1970. Mechanical jewelled movement. Pavé set diamond and tiger’s eye dial with central rotating tiger’s eye disc set with one diamond to indicate the hour and dauphine hand to indicate the minute. Case with diamond set stepped bezel and bow. Case, dial and movement signed, case and movement numbered. Comes with associated gold and diamond set chain.
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Diameter: 43 mm
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Signed: Piaget