Audemars Piguet Royal Oak 15407ST.OO.1220ST.01 Double Balance Wheel Stainless Steel Openworked Dial

Description

Launched in 2016, the Royal Oak Double Balance Wheel openworked introduced one of Audemars Piguet’s most significant mechanical innovations of the modern era. The patented double balance wheel system positions two balance wheels and two hairsprings on the same axis, oscillating in harmony to counteract positional errors and enhance chronometric stability — a genuinely novel departure from centuries of single-balance wheel construction. Reference 15407ST executes this innovation within the iconic 41mm Royal Oak silhouette in stainless steel, distinguished by an openworked dial revealing the entirety of the Caliber 3132 architecture. The visual language combines gunmetal grey bridges with pink gold accents on the applied hour markers and balance bridge, creating a contemporary two-tone aesthetic that has secured this reference’s place among the most coveted openworked Royal Oaks in production.

The 41mm case in stainless steel measures just 9.9mm thick, featuring the signature octagonal bezel with eight hexagonal screws, screw-locked crown, and glareproofed sapphire crystal and caseback. The slate grey openworked dial reveals the movement architecture with pink gold applied hour markers and Royal Oak hands with luminescent coating. The in-house self-winding Caliber 3132 — 245 components at just 5.57mm thick with the patented double balance wheel mechanism — delivers a 45-hour power reserve, hand-finished throughout with beveled bridges and polished surfaces, completed by an integrated stainless steel Royal Oak bracelet with AP folding clasp.