Audemars Piguet Royal Oak Chronograph 41mm Steel Green Dial 26240ST. This Royal Oak Selfwinding Chronograph, which benefits from the latest Royal Oak design evolution, is crafted in a stainless steel case measuring 41mm in diameter. This design marries stainless steel with a green khaki “Grande Tapisserie” dial. The watch comes on a stainless steel bracelet with AP folding clasp. Model: Royal Oak Chronograph. Case Material: Stainless Steel. Bracelet Material: Stainless Steel. Box & Papers: Original box, original papers.