A very nicely preserved piece.
Obverse: in the pearl rim crowned royal monogram, 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:
MONET:NOV:ARG:REG:POL:1663;