Royal Oak, Reference 15400ST | A stainless steel wristwatch with date and bracelet | Circa 2018 Audemars Piguet Royal Oak, Reference 15400ST A stainless steel wristwatch with date and bracelet Circa 2018 Dial: silvered tapisserie Calibre: cal. 3120 automatic, 40 jewels Movement number: AJ8'874 Case: stainless steel, sapphire crystal display case back secured by 8 screws Case number: K13'755 Closure: stainless steel Audemars Piguet bracelet and double-folding clasp Size: 41 mm diameter, bracelet circumference approximately 195 mm (including additional links) Signed: case, dial and movement Box: yes Papers: yes Accessories: Audemars Piguet warranty card, instruciton manual, two additional links and presentation case with outer packaging