A very nice piece. Sheet metal defects.
A variety with a rosette and a double circle as characters starting the legends. A variety of legends not described in Kopicki.
Obverse: in the pearl rim the coat of arms of Gdansk, in the outer rim the legend:
MOIIETA○CIVITA○DAII;
Reverse: in the pearl rim a shield with a crowned eagle, in the outer rim legend:
KASIMIRVS○R○POLON;
Silver, diameter 20 mm, weight 1.48 g.