A French galvanic brooch or pendant from the turn of the century.
The brooch is made from a number of different metals which in close apposition are known to generate a small electric current and it was marketed as form of electrotherapeutic treatment.
The inscription reads ‘Medaille Electro Medical purifie le sang – assainit la bile – guerit les douleurs et les reumatismes. La sante pour tout’ around the head of Aristotle, the father of medicine. Translated this approximates to ‘Medical electric medallion, purifies blood, cleanses bile, cures pains and rheumatism, health for all’. Along with the maker’s name, ‘E Osselin’
A similar example can be seen in the National Science Museum