Silver-tone stainless steel case with a silver-tone stainless steel bracelet. Fixed stainless steel bezel. Index hour markers. Audemars Piguet Calibre 2924 SQ hand wind movement with a 70-hour power reserve. Scratch resistant mineral crystal. Screw down crown. Transparent case back. Case size: 41 mm. Deployment clasp. Functions: tourbillon. Additional Info: limited to 100. Sport watch style. Watch label: Swiss Made. Audemars Piguet Ultra Thin Tourbillon Openworked 26518ST.OO.1220ST.01.