Six American Arts & Crafts Derby Hand Beaten Silver Plated Water Goblets. THe bottoms marked Derby S.P. / International Co., EPNS, W.M. Mounts (White Metal Mounts), Hand Beaten. Each measures 3.25x3.25x6.25". Weight combined is 2 pds 6 oz. PROVENANCE: A Washington DC / Charleston SC Private Estate. The Derby Silver Company (sometimes used the name Derby Silverplate Company), Birmingham, Connecticut, was founded in 1873. In 1898 they were one of the original firms that merged to form the International Silver Company. International Silver continued to use the trademarks of the original companies for many years.