Obverse: crowned letter K with circles under it and on the sides in a decorative rosette and border. Reverse: lion stepping to the left, inscription in the rim. Extremely rare Rus quarterback. A characteristic feature of Casimir the Great's Ruthenian quarters is the monogram K in a single or double rosette. A characteristic feature of the early quartos of his successor in Ruthenia, Wladyslaw Opolczyk, is the W monogram in a rosette surrounded by a continuous border. The piece on display has a K monogram in a double rosette surrounded by a border.