A nice, glossy piece. Well preserved details.
An undescribed punctuation variant in Iger.
Obverse: royal bust wearing crown, and armor, with tubular orifice seen from above, to the right, in the rim legend:
SIGi 3 D G REX POL M D L-;
Reverse: denomination mark III, below it coats of arms Eagle - of the Crown of the Kingdom of Poland, Snop - of the Vasa dynasty and Pogo - of the Grand Duchy of Lithuania, below it legend in three lines:
GROS-ARG/TRIP REG/POLO 97, below it the coat of arms - Levart of the Grand Crown Treasurer Jan Firlej between initials I-F, on the left and right mint marks.