AP was the first company to introduce the Tourbillon with an automatic winding system (1986). The STC (2014) has a dial-mounted peripheral automatic rotor; meaning the rotor winds around the movement, not blocking the view for you to enjoy. The Tourbillon is a classic one minute Tourbillon. The Chronograph is very difficult to describe by words; the pushers are positive yet soft to operate; is a true joy to press. I urge you to try it when you have the chance. The Audemars Piguet Royal Oak Offshore Selfwinding Tourbillon Chronograph is a 44mm case made by a combination of black ceramic, forged carbon and titanium. In house caliber 2897 movement, 34 jewels with 335 hand-decorated components. 21,600 vibrations per hour, power reserve of 65 hours.Price at the time of release was approx US$300,000.00