AUDEMARS PIGUET. A FINE AND RARE 18K GOLD AUTOMATIC TOURBILLON WRISTWATCH SIGNED AUDEMARS PIGUET, TOURBILLON AUTOMATIQUE MODEL, REF. 25643BA, CASE NO. 213, MANUFACTURED 1990 Movement: cal. 2870, tourbillon regulator with titanium cage, automatic, 32 jewels, signed Dial: signed Case: snap on back acting as movement plate, 28.5 mm. wide, 36.5 mm. overall length, signed With: 18K gold Audemars Piguet buckle