With the 15407ST.OO.1220ST.01 Audemars Piguet brings forth innovation with its patented double balance wheel geometry that improves precision and stability in your timepiece. The 15407ST.OO.1220ST.01 has a stainless-steel case that is 41mm in diameter and 9.9mm in thick with a glare-proof sapphire crystal, exhibition case back and a screw-locked crown. The openwork steel dial is slate gray with luminescent pink gold hour markers and hands. The 15407ST.OO.1220ST.01 is powered by the self-winding 3132 caliber which has a power reserve of 45 hours. The case is paired with a stainless-steel bracelet with an AP folding clasp. It has a water resistance of 50 meters (164 feet).