Audemars Piguet Quantieme Perpetual Calendar in 18k on original black alligator strap with 18k tang buckle. Auto w/ sweep seconds, date, day, month and perpetual calendar. Ref c15809. Circa 1980. Fine Pre-owned Audemars Piguet Watch. Certified preowned Dress Audemars Piguet Perpetual Calendar c15809 watch is made out of yellow gold on a Black Strap band with a 18k tang buckle. This Audemars Piguet watch has a 36 x 36 mm case with a Round caseback and White Stick dial. It is Gray and Sons Certified Authentic and comes backed by our 12-month warranty. Each watch is inspected by our certified in-house Swiss-trained watchmakers before shipment including final servicing, cleaning, and polishing.