Audemars Piguet, Fine Quantieme Perpetual Calendar, 18k Gold, Self Winding, circa 1980's Case: 36 mm, 18k yellow gold, three body, solid snap back, rounded and stepped bezel, No. 1659 Dial: white, applied gold baton indexes, subsidiary dials for the days, months and date, graduation scale for the age of the moon, gold and blued steel baton hands Movement: AP caliber 2120/2, rhodium finish, 38 jewels, adjusted heat, cold, isochronism and five positions, 21k gold rotor segment, monometallic balance with shock absorber Band: leather, plated buckle Signed: Audemars Piguet on the case, dial and movement HID03101062020 © 2020 Heritage Auctions | All Rights Reserved