Produced after the prototype that was released in 2018, the Royal Oak RD#2, the Audemars Piguet Royal Oak Perpetual Ultra-Thin ref. 26586 is the thinnest perpetual calendar in the market at 6.2 mm in thickness. Available in titanium or 18K yellow gold —both with a smooth vertical satin-brushed dial instead of the usual tapisserie dial—, now comes a new iteration of this reference.