Audemars Piguet’s Royal Oak Chronograph RD#5, a Thin Watch with Tall Ambitions
Audemars Piguet (AP) reinvents the chronograph with the Royal Oak “Jumbo” Extra-Thin Selfwinding Flying Tourbillon Chronograph RD#5. Inside the titanium and palladium BMG case – standing just 8.1 mm high – is the cal. 8100, a new take on the chronograph mechanism that employs spring-loaded racks to gather and store energy. The RD#5 is the fifth and final instalment in the “RD” series of watches that underline the impressive technical know-how of AP, particularly its Le Locle manufacture that evolved from Renaud & Papi (APRP). Conceived with the goal of creating a chronograph that is extra slim and easy on the fingers, the RD#5 boasts exceptionally light and comfortable pusher feel, an instantaneously-jumping minutes counter, and an exceptionally slim profile (thanks in part to peripheral winding), all while remaining amenable to industrial-haute horlogerie manufacturing. It’s one of the most technically interesting debuts of 2025, and we explain AP’s new take on the chronograph in detail below. The cal. 8100 with its unorthodox chronograph and peripheral rotor Initial thoughts Outwardly just another Royal Oak, with the same ideal proportions and class-leading bracelet as the iconic “Jumbo”, the RD#5 is actually one of the most innovative mechanical chronographs in recent years. Perhaps the only comparison for out-of-the-box chronograph construction is AgenGraphe that was unveiled almost a decade ago. The watch was evidently developed with two goals in ...
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