It is made from nickel/silver and is a "Essai au module de 20 francs 1896" which translates as a 20 francs 1896 test module, it is Good news for you as this coin is valued between €230 - €280 and has been sold at €285 (Approximately 302.40$ | 204.40£)
This information has come purely from online research so I cannot say that this information is 100% accurate so the price could be lower or higher.
it is a medallion/coin from the Carol Plante Collection
Listing for a VF
Listing for EF
Both are pretty much commanding the same price.
also another sold here
Here
seems to be a very desirable coin, which I imagine will need to be authenticated before selling (if that is indeed what you plan on doing.)
nice find.
Restoration addict : Verdigris Removal : Zinc White spot removal : Iron Rust Removal : Silver brooch/necklace mount Removal