Audemars Piguet Tourbillon Extra-Thin Openworked

Audemars Piguet's Royal Oak Tourbillon Extra-Thin Openworked, reference 26518OR.OO.1220OR.01, has a 41 mm case in rose gold. The case measures 8.95 mm thick and carries a sapphire crystal over the openworked dial. Inside is the hand-wound calibre 2924, skeletonised to reveal the mainplate and bridges in gold. The tourbillon regulator sits visible within the movement, a feature that anchors this piece as a serious mechanical exercise rather than a plain dress watch. Audemars Piguet issued this reference as a limited edition of fifty pieces. The rose gold bracelet closes with an AP folding clasp, matching the case in finish. Water resistance is a modest 20 metres, enough for everyday wear but not for swimming.