Duchy of Courland, 3 groschen 1598, Mitau

A nicely preserved piece of rare Kurland trojak with an ES instead of SE error.

Obverse: bust in tubular orifice and armor, to the right, in the rim a 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/-ET-ES-/-98-;