This is a stainless steel Audemars Piguet Royal Oak 15500ST.OO.1220ST.01. It includes a solid 41mm diameter three-body polished and brushed case on an integral stainless-steel bracelet. It has 8 white gold screws that secure the octagonal bezel and transparent sapphire crystal case back. The blue dial has a grande tapisserie waffle decoration, luminous applied steel faceted baton index hour markers, luminous steel baton hands, and a plain blue perimeter chapter ring with white second and minute divisions. The date aperture is at 3 o’clock and it has a signed screw down hexagonal winding crown. It’s water resistant to 50 meters, and there is a 70-hour power reserve. The 10.4mm thick case, dial, and movement are all signed.

This Audemars Piguet Royal Oak 15500ST.OO.1220ST.01 has a mechanical automatic self-winding Audemars Piguet caliber 4302 movement that’s rhodium-plated with Cotes de Geneve embellishment. It’s constructed with 32 jewels, 257 components, a straight-line lever escapement, and a shock absorber mechanism. It has a suspended barrel, and the 22K rose gold skeletonized oscillating weight has an AP logo and an annular ring that runs on four jewels. It has a monometallic Gyromax balance that’s adjusted for heat, cold, and 5 positions. There is a self-compensating flat balance-spring, a variable inertia block balance, and a central hacking seconds mechanism. The mechanism oscillates at a frequency of 28,800 vph (4Hz).

The Audemars Piguet Royal Oak 15500ST.OO.1220ST.01 was released in 2019

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