Sterling Silver Seahorse Under the Sea Brooch. Beaucraft Sterling cutout circle brooch features a seahorse and fish scene in a seaweed or kelp design frame. Marked Beau Sterling. Beaucraft was located in Providence, Rhode Island and was in operation from 1947 until September 2004. We've not been able to nail down an exact date for this brooch but believe it to be from the 1960-1970 range.