A beautiful perfectly struck, mint piece.
Minus for single blemish in the background - slightly rubbed in front of the bust of the ruler.
A variant of punctuation not described in Iger.
Obverse: denomination +III+, below it the coat of arms of Riga, separating the date 15-93 and the beginning of the GR-OS legend, below it further 3 lines of the legend ending with a lily:
ARG+TRIP/CIVI+RI/+GE;
Reverse: crowned royal bust with numerous jewels in the rim of the crown, wearing armor, with a tubular orifice seen from above, to the right, surrounded by the legend:
SIG+III:D:G:REX+PO+D+LIV;