Audemars Piguet, Royal Oak Jumbo, Automatic, No. 721, Ref. 5402BA. Made in 1970's. Fine and very rare, octagonal, self-winding, water-resistant, 18k yellow gold wristwatch with date and an 18k yellow gold Audemars Piguet bracelet with deployant clasp.

Case : Two-body, polished and brushed, octagonal bezel set with 8 hexagonal nuts embanked in 8 screws on the case back, angled lugs with 4 screws to fi x the strap, sapphire crystal. Dial : Champagne, clous de Paris decoration, applied gold baton indexes, applied gold Audemars Piguet logo at 6, outer black minute divisions, aperture for the date. Luminous gold baton hands. Movement : Cal. 2121, rhodium-plated, fausses cotes decoration, 36 jewels, straight line lever escapement, Gyromax balance adjusted for heat, cold, isochronism and 5 positions, shock-absorber, self-compensating fl at balance spring, 21K gold rotor. Dial, case and movement signed. Dim. 39 x 48 mm. Thickness 7 mm. Approx. overall length 180 mm.