Ян II Казимир
Półtorak (lit. "one-and-a-halfer") was a small coin equal to 1½ grosz struck in Polish–Lithuanian Commonwealth in the 17th century, during the reign of Sigismund III Vasa and John II Casimir Vasa. Initially a silver coin, with time its value deteriorated and the coin went out of use. Augustus III of Poland unsuccessfully tried to reintroduce it as a copper coin. The name stems from the Polish word "półtora" meaning "one and a half".