This is a large silver gilt brooch with mother of pearl flowers and leaf marked 'Ocean Treasure - Sterling'. I am not sure of the date - but love the brooch. Full details on my web site - www.gillianhorsup.com - price £85 reference 2658 B138/31.
I sell an eclectic mix of vintage jewellery, vintage costume jewellery, vintage bags, compacts and accessories at Vintage Modes, Grays Antiques in central London, U.K. I particularly like Art Deco. See my web site - www.gillianhorsup.com