A beautiful piece.
A rarer coin in this state of preservation.
Variety with a punched Q on R in POTIORQ3 not described in the literature.
Obverse: crowned royal monogram in pearl rim, legend in rim:
POTIOQ/RQ3 METALLO EST, in outer rim legend: DAT:PRETIVM:SERVATA:SALVS;
Reverse: in the pearl rim a crowned shield with the coats of arms of the Crown, Grand Duchy and Snopes, in the field of the shield the denomination XXX GRO/-POL-, on the sides of the shield the initials A-T, in the outer rim the legend:
MONET:NOV:ARG:REG:POL:1665;