Audemars Piguet Royal Oak Ref. 4287BA Self-winding Watch 18KYG. S : New or new without a tag. A : Good condition with minor sigh of use. AB : Used condition with some damages. B : Obvious sigh of use with heavy damages. 1.3 ” Inner Circumference: 7.3 “. 34 mm Inner Circumference: 18.5 cm. Case, Certificate of Repair. International Buyers – Please Note.