A nice piece.
Variety with rosette and double circle as marks starting legends.
Variety with an eagle without a crown in a variant not described in Kopicki, where the basic variant rated R4 in rarity grade.
Obverse: in the pearl rim the coat of arms of Gdańsk, in the outer rim the legend:
COIN CIVIT:DANC3;
Reverse: in the pearl rim a shield with an eagle, in the outer rim legend:
KASIMIRVS:R:POLONI;
Silver, diameter 19 x 20.5 mm, weight 1.59 g.