Rare Vilnius schilling of John II Casimir, a variety with an abbreviated date on the sides of the royal monogram on the obverse and Knight on the reverse, with the Gozdawa coat of arms sharing the legend of the reverse.
Exact same variety is unlisted in the Ivanauskas catalogue, the presented coin is an interesting hybrid of the Ivanauskas types 2JK5-1 (R) (obverse) and 2JK4-1 (reverse).
