Seller: thebigredfan (585) 100%, Location: Bloomington, Indiana, Ships to: US, Item: 233348724636 Initially, I thought it was an old piece of advertising for your keychain! No, it's a galvanic medicinal electro-therapeutic medallion! -"Boyd's Battery...Lon. Eng. Jan 17.1878 IMP.1879" - Early Quack!. Looks like copper, zinc, brass discs...measures ~1 1/4", weighs 11gr./0.4oz. Needs a good scrub! Please check photos; email any questions before bidding. Will ship USPS Priority Mail package within 2 business days of receipt of payment. PayPal is preferred. Thanks for your interest!. Maker: Boyd ?