Audemars Piguet Royal-Oak Dual Time Blue Dial ref. 25730STSoon after introducing the original Royal Oak 5402, Audemars Piguet began exploring ways to incorporate various complications into its distinctive angular case. From sophisticated perpetual calendars to multiple chronograph variants, the brand adapted the Royal Oaks design to house an expanding set of functions, responding to shifting tastes and a growing desire for variety among collectors Having previously developed a dual time mechanism for an