Audemars Piguet, a gentleman's 18 carat gold wristwatch, circa 1980, ref. 75172, the three piece open back case, with silvered dial, black Roman numerals and swallow hands, 36 Jewel Audemars Piguet automatic movement adjusted to five positions, heat and cold isochronisms, cal. 2120/1, no. 339744, the case 33mm diameter, on an integral 18 carat gold block link bracelet with snap clasp, in an Audemars Piguet case