A nice, well minted piece.
For a Lvov production of decidedly above-average appearance.
Obverse: in the rim bust of the king wearing a crown, armor to the right, on the sides denomination mark I-8, in the outer rim legend:
IO:CASIM:D:G REX-POL-M D:RVS:PRVS;
Reverse: crowned five-field escutcheon with the coats of arms of the Crown, the Grand Duchy and the Vasa dynasty, outer rim legend:
NEC:NON:SVEC:GOTH:VAND:Q:HE:REX;
Definitely recommended!