John II Casimir, 6 groschen 1656/7, Cracow - date overstriked

A nice , circulated piece with residual luster.

Variety with date punch.

Obverse: bust of the ruler to the right, in the outer rim the legend:
IO CASIM D G-REX P & S;

Reverse: crowned shields of the Coat of Arms of the Crown of the Kingdom of Poland, the Grand Duchy of Lithuania and the Vasa dynasty, under the crown the denomination mark VI, in the outer rim legend:
MON ARGEN-REG POL 1656/7;