Another Unknown Late Medieval Coin.

What makes you think it's Ian Albert (are you thinking about https://en.wikipedia.org/wiki/John_I_Albert ?).

@echizento, I see what you mean about the obv looking like a coin from Jan Olbracht (e.g. Kopicki #387). I'm not convinced though for two reasons. First, the rev design would then be a crown and no matter which way I look at your rev, I can't make that work. Second, the circle around the central design elements should be about 10 mm or so and your coin has much larger circles if the overall diameter is 17 mm. I'll see if I can offer an alternate attribution.

That eagle beak on the obv protrudes much more than normal and should be diagnostic. However, I'm having a hard time finding it though and have done a pretty thorough look through all Polish coins through the 1800s and everything German from the 1600s. Nothing seems like a good match for that squiggle on the rev. Unless I have an epiphany, I think that I'm stumped.

I've found a similar eagle on trzeciak (1/3 of a half groschen) of Wladyslaw II Jagiello they had anywhere between 15.2-18.2 mm and 0.5-0.87g. The weight, diameter and the eagle seem to fit in, but the reverse seems to be something completely different.