Double Balance Wheel System
Two balance wheels and balance springs are assembled coaxially, helping compensate for variations and improving the movement’s precision and stability.
The Audemars Piguet Royal Oak Double Balance Wheel Openworked reference 15407ST.OO.1220ST.01 combines the unmistakable architecture of the Royal Oak with an innovative openworked self-winding movement.
Introduced in 2016, the model brought Audemars Piguet’s patented double balance wheel system to a 41 mm Royal Oak case. Two balance wheels and two balance springs are mounted on the same axis, creating a highly distinctive mechanical display visible from both sides of the watch.
The absence of a conventional dial reveals the movement’s bridges, wheels and regulating organs. Applied hour markers and Royal Oak hands appear to float above the mechanism while preserving a clear and balanced time display.
Alternating brushed and polished surfaces emphasize the octagonal bezel, exposed screws and integrated bracelet that have defined the Royal Oak collection since its introduction.
Two balance wheels and balance springs are assembled coaxially, helping compensate for variations and improving the movement’s precision and stability.
The bridges and plates are extensively opened to reveal the mechanical components while maintaining the structural strength required by the calibre.
The self-winding movement displays hours, minutes and central seconds and provides approximately 45 hours of power reserve.
Satin-brushed surfaces are contrasted by polished bevels across the case and bezel, highlighting the Royal Oak’s angular construction.
Glareproofed sapphire crystals on both sides offer an uninterrupted view of the openworked calibre and its double balance mechanism.
The stainless-steel bracelet follows the lines of the case and combines brushed links, polished bevels and an AP double-folding clasp.
Pre-Owned / Circa 2019
This is a pre-owned timepiece produced circa 2019. Review the photographs and the individual condition report for the precise cosmetic and mechanical condition of the watch.
Condition to Be Confirmed
The openworked movement, hands, applied hour markers and sapphire crystals should be assessed through photographs of the actual timepiece and its accompanying condition report.
Condition to Be Confirmed
The stainless-steel case, octagonal bezel and integrated bracelet may display signs consistent with previous ownership. The precise condition should be represented by the product photographs.
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