The Royal Oak Tourbillon Chronograph comes in a 44mm case, and it's one of the bigger Royal Oak models that isn't an Offshore. It runs on a hand-wound caliber 2889 movement, which has a tourbillon and a column wheel chronograph - a classic AP combo. The Reference 26039BC.ZZ.1205BC.01 version has a white gold case with a bezel covered in diamonds. The dial is also adorned with diamonds and has mother-of-pearl subdials for a luxurious touch.