In 2012, the Royal Oak Ultra Thin Tourbillon was released, combining the iconic Royal Oak design with a hand-wound movement featuring a tourbillon escapement. It was the first Royal Oak model without any extra features to feature this highly coveted escapement. Previous versions, like the 1997 limited edition, 1999 Tradition d'Excellence, and later Chrono Tourbillon and Concept watches, all had additional functions. Limited to just 10 pieces, the 2020 reference 26521BC.ZZ.1220BC.01 is exclusively available in the Japanese market. Its White Gold case is adorned with 32 baguette-cut diamonds on the bezel and a Black dial with a unique