Poland, John Casimir, the Crown, ort 1656, Cracow mint.
On the obverse: CASIMI and I - T (Mintmaster Jan Thamm) under the bust, on the reverse: I•C (Jakub Czamer, mint lessee) under the coat of arms.
Silver, 6.12 g, 28.2 mm. Kop. 1742, Shatalin KR56-I-5, Tyszkiewicz 2 mk.
Grade: Good VF, nice, fully legible specimen.