Heritage Narrative The Audemars Piguet Royal Oak Double Balance Wheel Openworked reference 15407BA.OO.1220BA.01 is one of the most technically and visually striking expressions of the modern Royal Oak. Executed entirely in 18kt yellow gold and featuring a fully openworked dial, this reference combines the Royal Oak’s iconic architecture with high-end mechanical innovation designed to improve stability and chronometric consistency. At the center of the watch is Audemars Piguet’s patented Double Balance Wheel system, utilizing two balance wheels and two hairsprings mounted on the same axis. This construction enhances precision by improving rate stability and resistance to positional variation, while also creating a distinctive, symmetrical visual signature. In the openworked configuration, the movement becomes the dial, offering full visibility into the balance assembly and the finishing that defines AP’s haute horlogerie standard. The 41 mm yellow gold Royal Oak case and integrated bracelet retain Gérald Genta’s original design language: sharp bevels, brushed planes, and polished chamfers, executed with the complex contrast finishing for which the Royal Oak is known. The octagonal bezel and exposed screws remain instantly recognizable, while the openworked execution elevates the watch from sports-luxury icon to contemporary mechanical showcase. Presented as a full set and in pre-owned condition, this Royal Oak 15407BA appeals to collectors seeking an uncompromising combination of precious metal presence, technical innovation, and modern openworked Royal Oak identity. Technical Specifications Brand:Audemars Piguet Model:Royal Oak Double Balance Wheel Openworked Reference:15407BA.OO.1220BA.01 Case:41 mm 18kt yellow gold case Bezel:18kt yellow gold octagonal bezel Crystal:Sapphire crystal Dial / Display:Openworked / transparent dialLuminous hands and indices Movement:Audemars Piguet self-winding automatic mechanical movementDouble Balance Wheel system Complications / Functions:Time onlyDouble Balance Wheel (technical regulating organ) Bracelet:18kt yellow gold integrated bracelet Clasp:Deployant clasp in 18kt yellow gold Water Resistance:50 m (factory specification) Condition & Inclusions Overall Condition:Pre-owned Service Status:Movement tested and functioning correctly Set:Full set — includes box and warranty Shipping & Logistics The watch is stored securely and shipped fully insured within 1–3 business days. Worldwide shipping is available. Any applicable import duties or taxes are the responsibility of the buyer. Shipping & Returns Complimentary insured worldwide shipping and a 14-day return window. Each timepiece is authenticated, time-tested, and professionally prepared prior to dispatch. Secure packaging, tracking, and full insurance are included with every shipment.