Update:
I checked another denari from the same era and place. This one is clearly listed as being minted in Demmin. It has the same symbolic and a similar legend, atleast partially. Here's a comparison of the coins.

(Coin with uncertain mint)

(Coin above according to Dannenberg. Text, reverse: KASTRV
This could mean either castle or Kasimir, who was the ruler of Pomerania-Demmin)

(Coin certainly from Demmin, it has both BVGVZLAVS (For Boleslaus, the Duke of Pomerania-Stettin) and CASE[…]LAVS, standing for Casimir)
I'd say that the coin was most likely minted in Demmin, just like the one above, but I can't be 100% sure. There are a lot of similarities between them. But I'm still looking for other opinions.