The Royal Oak 15450 made its debut in 2012, sporting a 37mm case - 2mm smaller than the previous 15300. Its counterpart, the 15400, released the same year, is 2mm larger. Behind the dial ticks the self-winding caliber 3120, visible through the case back. The dial boasts AP's classic 'Grande Tapisserie' pattern.In honor of the ladies Royal Oak's 40th anniversary, the collection welcomed the 15454OR.GG.1259OR.01. It showcases a new frosted finish on the case, achieved through an ancient metalworking technique from Florence.