A nicely preserved piece.
A variant of punctuation not described in Biełopolski and Szlapinski.
Obverse: crowned royal monogram in the pearl rim, in the rim legend:
POTIORQ3: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 initials A-T, in the outer rim legend:
COIN:NOV:ARG:REG:POL 1663;