Audemars Piguet: A fine white gold and diamond-set automatic skeletonised wristwatch glazed to the front and back and with diamond-set bezel and lugs, the finely chased and engraved skeletonised movement with signed gold rotor, 36 jewels, adjusted to heat, cold, isochronism and to five positions numbered 157378, the case numbered B18572, with black leather strap and makers white gold buckle