Portrait variety, with a narrower bust of the king.
Obverse: bust of John Casimir to the right, below it a shield with the number 3. In the rim:
IOAN - CAS - D : G - R - EX - P - & S - M - D L R - P -.
Reverse: crowned eagle to the left, not preceding the legend. In the rim:
* COIN - NOVA - REG - POLON - 1658.
High rarity.
Silver, diameter 21 mm, weight 1,235 g.