https://en.numista.com/catalogue/pieces36696.html
But the lettering doesn't match. Is it just a different variety of the same coin, or something else? I can see a "15" in the correct place for the first two numbers of the date, so I think I'm at least looking at the right century. I picked it up in a cheap lot of 5 coins, 4 coppers and this 1 silver.


I bought it for the silver coin, but with a bit more searching and a big magnifying glass I might be able to figure out one copper as well. There's no reason to think it's from Poland or the same century as the silver, ebay just said "Lot of 5 Medieval Coins." with no info on them. The other 3 coppers are pure garbage. If you happen to recognize something on this copper that's cool, but the silver is really what I want info on!


14mm, 0.32g. Not even sure which side is supposed to be up...
