The London Science Museum has a virtually identical amulet on its site and notes:
“Electrogalvanic amulet, zinc, copper and white metal disc, made by Joseph Raspail, French, 1870-1930, with crescent moon at center and six maple(?) leaves around it, no chain. Inscribed around edge of face ‘La mysterieuse pile electrique de sante de Joseph Raspail Brevete S.G.D.G.’ and nearer centre ‘Son fluide magnetique par excellence’. Also ‘ATTRACTION’ between horns of moon. On reverse around edge, ‘Toujours en contact avec vous
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