Audemars Piguet Selfwinding

Audemars Piguet's Royal Oak Selfwinding 15550BA.OO.1356BA.02 is a 37 mm case in 18-carat yellow gold. The case measures 8.9 mm thick and carries a gold dial under a sapphire crystal. Inside is the self-winding calibre 5909, which drives hours, minutes and a centre seconds function. This reference is a limited edition, produced for the collaboration between Audemars Piguet and Matthew Williams. The dial's central seconds hand runs quietly rather than sweeping over sub-registers, keeping the layout uncluttered. A yellow gold bracelet with an AP folding clasp completes the piece. Water resistance is set at 50 metres, modest but typical for a dress-oriented Royal Oak in precious metal.