I usually rely on WCN.
This type was often made poorly, so the grading standards are a bit generous compared to the appearance of the coin.
I can find examples in the WCN archive that look like yours with a grade III (the III- coins mostly look worse). Here are a couple of examples:
https://wcn.pl/archive/381704?q=Polska+1665
https://wcn.pl/archive/383968?q=Polska+1665
And two they graded III-:
https://wcn.pl/archive/374962?q=Polska+1665
https://wcn.pl/archive/377913?q=Polska+1665
The lettering is in very nice condition on yours, but it's too bad there is a weak spot in the center 🙁.