SCREW FOR 42MM AUDEMARS PIGUET AP ROYAL OFFSHORE 426401RO,26400SO,26405CE 21670S
It will fits 42mm Model: 26401RO. OO.A002CA.01, 26400SO. OO.A002CA.01, 26405CE. OO.A002CA.02, 26408OR. It is made to fit your 42mm Audemars Ceramic Offshore 21670ST for watch bezel and case back.