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The Audemars Piguet Royal Oak Concept Flying Tourbillon 38.5mm (ref. 26228BC.ZZ.D011CR.01) is a manual sport watch, with a 38.5mm 18-carat white gold case, powered by the Audemars Piguet 2951 movement and a 77-hour power reserve. Water resistance is rated to 20m, under a sapphire crystal.