Audemars Piguet Selfwinding "50th Anniversary"

The Audemars Piguet Royal Oak Selfwinding "50th Anniversary", reference 15551ST.ZZ.1356ST.01, has an octagonal case in stainless steel measuring 37mm across and 9.1mm thick, paired with a steel bracelet. The blue Tapisserie dial is protected by a glareproofed sapphire crystal and displays hours, minutes, centre seconds, and a simple calendar. It is powered by the selfwinding automatic calibre 5900, offering 60 hours of power reserve, and the case is water resistant to 50 metres.