Audemars Piguet 15407ST (Pre-owned - Excellent) — USD 180,000 on eBay

The Audemars Piguet Royal Oak Double Balance Wheel Openworked, reference 15407ST, is a contemporary interpretation within the Royal Oak collection, distinguished by its openworked dial and movement architecture. It showcases the brand's commitment to both traditional finishing and modern horological display. This reference features a 41mm stainless steel case with the signature octagonal bezel secured by eight hexagonal screws. It houses the self-winding Caliber 3132, which incorporates two balance wheels and two hairsprings assembled on the same axis, designed to enhance precision and stability. The movement is visible through both the openworked dial and the sapphire case back. The 15407ST is significant for collectors interested in Audemars Piguet's technical innovations and aesthetic transparency. Its openworked design allows for a direct view into the intricate mechanics, highlighting the craftsmanship applied to the movement components. This model represents a blend of the Royal Oak's established design codes with advanced horological engineering.