Matthew Bain Inc is based in Miami Beach, Florida. Audemars Piguet Royal Oak Offsho. Matthew Bain is a world renowned watch collector, dealer and authority on fine vintage and modern watches. Audemars piguet royal oak offshore 26420so. oo. a002ca. 01 automatic watch this item is in the category jewelry & watches\watches, parts & accessories\watches\wristwatches.