AUDEMARS PIGUET ROYAL OAK II Reference: 8638BA. Serial number: 520. 18k yellow gold case. Anthracite grey dial, baton hour-markers. Self-winding mechanical movement (calibre 2062). Strap in 18k yellow gold with signed folding clasp. Sapphire crystal. Circa 1980. Diameter: 29 mm. Gross weight: 120.1 g. An 18k gold wristwatch automatic movement, by Audemars Piguet. Circa 1980. RC: Sold as is, with traces of wear and use. Service dial and bracelet. Movement functional at the time of the writing of the description, to envisage revision of use, without guarantee.