This
Audemars Piguet Royal Oak ref. 26586XT.OO.1240XT.99 is a limited edition
Ultra Thin Perpetual Calendar.
The 41 mm case and the bracelet both combine satin-brushed titanium with polished BMG.
The satin-brushed smoked ivory dial is enhanced with silver subdials and white gold Eastern Arabic numerals.
The rotor of calibre 5133 has a special decoration.
Best, Emmanuel
credit: @ mm_beyat (1), @thewatchrookie (2-3) & Audeamrs Piguet