Nicely preserved piece with lots of luster in the background.
Very rare typologically variety with POLO in the obverse legend.
The reverse of this piece was used by D. Pączkowski to illustrate the variety in his catalog of these coins published in Warsaw Numismatic Diary No. 9.
Obverse: in the linear border bust of the ruler wearing a crown, armor, with a robe studded with jewels, to the right, in the outer border legend punctuated by the coat of arms of the Half-Cossic Sub-Treasurer of the Great Crown:
SIGIS-III-D G-REX--POLO-M D L:;
Reverse: crowned escutcheons with the coats of arms of the Crown, the Grand Duchy of Lithuania and the Snopes coat of arms of the Vasa dynasty, under the crown the denomination mark VI, in a pearl border, in the outer border the legend:
GROS-ARGE-SEX-REG-POL-1626-;