Audemars Piguet Swiss, "Tourbillon Automatique", Case No. 311, Ref. BA 25643/002, 32 x 28 mm, circa 1986
A gentleman's very fine, ultra-thin, automatic Geneva wristwatch with tourbillon - sold in April 1990 - with original box, operating instructions and original certificate Case: 18k gold, push back, back winder, AP 18k gold buckle. Dial: gilt, structured, applied gold indexes, window for tourbillon cage, window for platinum-iridium pendulum winding rotor, leaf hands. Movm.: oscillating weight winding movement, rhodium-plated, 32 jewels, finely matted tourbillon cage, Glucydur screw balance.
Audemars Piguet "Tourbillon Automatique" Audemars Piguet launched the first self-winding wristwatch with tourbillon in 1986; it was at the time also the smallest and flattest wristwatch in the world. The self-winding mechanism uses an eccentric weight and the tourbillon case is made from titanium, with one rotation per minute. Illustrated and described in: G.L. Brunner/Ch. Pfeiffer-Belli/M.K. Wehrli "Audemars Piguet", Munich 1992, p. 274
Estimate 15,000 - 17,000 €
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