Bundle with other cufflinks and save on shipping! Black, Yellow/Gold, Heather Green and Ruby Red Marked Silver 925 Stamped with BB Golden Fleece logo Following 1868, sterling silver became the standard for coins, and in 1907, a standard sterling silver mark was introduced. The Federal government now required manufacturers to mark sterling silver pieces with a “925” mark, guaranteeing that the piece was at least. 925 or 92.5% silver. This acted like an assay mark.