Unknown coin (medieval?)

Hi,
I bought this coin today, but I can’t help myself identifying the issuer, value, period etc. I think is silver, or silver played copper/bronze.
Thank you.

As far as I can tell it's a medieval Hungarian denar, something like: https://en.numista.com/catalogue/pieces178915.html but it's impossible to tell exactly which one from your photo. Please upload a better photo with more lighting.

Citeer: "cro321"​As far as I can tell it's a medieval Hungarian denar, something like: https://en.numista.com/catalogue/pieces178915.html but it's impossible to tell exactly which one from your photo. Please upload a better photo with more lighting.

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I washed it now a bit wit warm water and soap. It is a small coin, i think is under 1 g in weight.

I still can't tell anything from the photos. Try reading the letter on the obverse (first photo), the name of the ruler should be there. A Hungarian denar in such grade usually has low value if any but even then washing it isn't a good idea, it lowers the value of the coin.

I left it some hours in acetone: