The Royal Oak Tourbillon Chronograph is a big watch, measuring in at 44mm. It's one of the larger non-Offshore models in the Royal Oak family. The hand-wound caliber 2889 movement is what makes this watch tick, combining a tourbillon with a column wheel chronograph - a classic AP feature. This particular model, reference 25977ST.OO.D002CR.01, features a stainless steel case. The dial and alligator strap are both sleek black, adding to the watch's sophisticated look.