Audemars Piguet Selfwinding Chronograph

Audemars Piguet's Royal Oak Selfwinding Chronograph, reference 26240ST.OO.1320ST.07, is a 41 mm steel chronograph. The case measures 6.8 mm thick and carries a white dial under a sapphire crystal. Inside is the self-winding calibre 4401, a manufacture movement built for this line. The watch has a flyback chronograph with small seconds and date, a combination that adds mechanical complexity beyond a standard chronograph. This function set puts it firmly in the chronograph category rather than a simple time-only piece. The steel bracelet closes with an AP folding clasp. Water resistance is set at 50 metres, adequate for daily wear rather than diving.