The Royal Oak Ultra Thin Tourbillon made its debut in 2012, combining the iconic Royal Oak design with a manual-winding movement and a tourbillon escapement. It was the first Royal Oak without any extra features to feature this highly sought-after mechanism, unlike previous versions such as the 1997 limited edition, 1999 Tradition d'Excellence, and later Chrono Tourbillon and Concept watches. The 2019 addition to the collection, reference 26522ST.OO.1220ST.01, is a limited edition of only 30 pieces specially made for Yoshida in Japan. It boasts a titanium case and a sleek smoked blue dial.