I bought this recently over internet in a batch named “Poland and Prussia” that was supposed to contain all silver coins. The coin is in bad shape and I am trying to identify it. It has around 16.5-17 mm diameter.
I think this side has some shield divided into four areas and the letters around I see are “???NGISIII.D:G.REX.POLONI???”

This side has a crown on top and maybe big stylized “S” in the center. The letters around I see are “.SOLID???GNI.POLO”

I tried searching catalog with these guessed letters and with the image and didn't find a match. The closes thing was Trzeciak poznański / Ternar - Zygmunt III Waza.

