A very nice piece.
A variant of punctuation not described in Ejzenhart and Miller.
Obverse: in the pearl border a bust of the ruler to the right, in the outer border a legend punctuated by a cartouche with the denomination 3:
SYLVI9 FRID-D-G---DVX-W-TI-S-O-;
Reverse: in the pearl rim a Silesian eagle, on its sides initials S-P, in the outer rim a legend:
CO-MON-DO-I-HEID-STER-& ME 16-74-;