42. Audemars Piguet. An 18K gold mid-size quartz calendar bracelet watch Model: Royal Oak Date: Circa 1985 Movement: Jewelled quartz Dial: Champagne grid, applied polished luminous filled baton hour markers, date aperture at 3, polished baton hands with luminous inserts Case: Brushed and polished octagonal, back secured by 8 screws, 8 screws to bezel, No.400 Strap/Bracelet: Fitted brushed 18K gold link Buckle/Clasp: Signed 18K gold folding clasp Signed: Case, dial & movement Size: 30mm Weight: 130,06g The Audemars Piguet Royal Oak series is regarded by many as the quintessential sports watch. The iconic design revered by horological connoisseurs is instantly recognizable with its structured strongbox case with structurally integral octagonal bezel secured by eight hexagonal screws.