Electrogalvanic amulet, Richardson's Magneto-Galvanic Battery, disc with heart at centre and 15 small discs arranged in a circle around it. Made of zinc, brass, copper, iron and nickel, no chain. Made by A.M. Richardson & Co., New York, USA, 1880-1900. Engraving on reverse side of heart says it was patented in U.S. Feb. 3, 1880, and registered in Canada Feb. 9, 1881. Note gap in outer ring around disc. Similar to A602763. See advert at http://www.bridgemanart.com/asset/375514/English-School-19th-century/Advertisement-for-'Richardson's-Magneto-Galvanic-B
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