Nice piece with great details. Etched disc.
Huge rarity Kurland trojak known from single quotations.
Obverse: bust in tubular orifice and armor, to the right, in the rim legend:
-MONE-ARG-CVR;
Reverse: coats of arms of the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania, above them the denomination mark III, below the legend:
GROS-AR-TR/DVCVM-CV/R-ET-SE/-98-;