A very nice piece with a beautiful sheen. Slightly off-center.
Error in CIVT obverse legend not described in Kopicki and CNG.
Obverse: in the pearl rim the coat of arms of Gdansk, in the outer rim the legend:
COIN○CIVT○DA○;
Reverse: in the pearl rim a shield with a crowned eagle, in the outer rim legend:
KASIMIRVS○REX○P;
Silver, diameter 20 mm, weight 1.49 g.