Audemars Piguet Selfwinding "50th Anniversary"

The Audemars Piguet Royal Oak Selfwinding "50th Anniversary", reference 15510ST.OO.1320ST.02, has a 41 mm stainless steel case. A sapphire crystal covers the black dial. The self-winding movement is the calibre 4302, with central seconds and a date function. It runs on Audemars Piguet's in-house architecture rather than a modular addition, though the fact sheet gives no thickness figure. The stainless steel bracelet closes with an AP folding clasp. Fit and finish follow the Royal Oak's established construction, integrating the bracelet directly into the case. Water resistance reaches 50 metres, and the folding clasp helps keep that rating secure on the wrist.