Audemars Piguet Royal Oak 15500ST. 01 Selfwinding Stainless Steel Blue Dial Men’s Watch. This Royal Oak Selfwinding is designed in a 41mm stainless steel case. It features the recognizable’Grand Tapisserie’ pattern on the blue dial, white gold markers and hands, and a date set at 3 o’clock. The watch is complimented by a stainless steel bracelet and AP folding clasp. Case Material: Stainless Steel. Bracelet Material: Stainless Steel. Box & Papers: Original box, original papers.