Watch List notes:

LITHUANIA, under Poland, John Casimir (1648-1668), half ducat, 1665KP, obverse laureate bust right, reverse horseman riding left, sword raised (Gum.1891, Fr. 10, Kopicki 3629 [R2], Ivanauskas 9JK2-2, H.-Cz.2284 [R2]). Nearly uncirculated and very rare.

In a slab by NGC as MS61.
Ex Ray Kaleda Collection, (Noble Numismatics Sale 113, lot 1974).