Audemars Piguet Tourbillon Extra-Thin Openworked

Audemars Piguet's Royal Oak Extra-Thin Openworked, reference 26518ST.OO.1220ST.01, has a 41 mm steel case. Case thickness comes in at 8.95 mm. The dial is openworked, set beneath a sapphire crystal, and the movement is the manual-winding Calibre 2924. Functions are limited to hours and minutes, kept plain against the open dial work. Audemars Piguet produced this reference as a limited edition. The steel bracelet fastens with an AP folding clasp. Water resistance is rated to 20 metres, modest figures that mark this out as a dress watch rather than a tool.