A nice piece.
An undescribed variant in Ejzenhart and Miller with the date entirely in front of the crown.
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-T-I-S-O-;
Reverse: in the pearl rim a Silesian eagle, on its sides initials S-P, in the outer rim a legend:
CO-MONT-DO-I-HEID-STER-&-ME-1674-;