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Oh and if a fren can help me out with identifying this coin. She came up in a lot of medieval coins. She's a silver lightweight, about half a gram.

Most approaching stuff i could find is those tiny silver coins called Angster, Haller, etc.. minted by the free cities in Germany and Switzerland during the middle age, who had a special status.
Maybe from Lucerne like here ?
https://fr.numista.com/catalogue/pieces291891.html

But i'm maybe completely missing the target, i've no idea what this is.