Collectable gift! Unisex; Marked 925 sterling; Excellent Condition; do damage; Vintage, Double sided cufflinks; Art appears be to porcelain or enamel; Jockey in red silks riding a tan horse jumping a steeplechase hedge and fence; Possibly British; possibly hand-painted... each has small differences Give to an equestrian friend, or keep for yourself! 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.