It will fit the 42mm Audemars Piguet Royal Offshore ROO AP26470 26133 watch which has 28mm lugs with 18mm at the buckle. It also will fit Audemars Piguet Watch Model Collection: Royal Oak, Offshore Diver 42 MM, 15707, 15703, 25721, 26470, 26178OK, and others.
eBay