A very nice piece of a typologically interesting item.
Obverse: in the pearl rim a half-figure of the ruler 3/4 to the right, on its sides the date 15-8Z, in the outer rim a legend divided by coats of arms:
D:G-FRI-WIL-DV-SAX-LA-N-THV-E-MAR-MI-MO-IMP;
Reverse: in the pearl rim a half-figure of the ruler 3/4 to the left, in the outer rim a legend punctuated by coats of arms:
D:G-IO-HAN-DV-SAX-LA-N-THV--E-MAR-MIS:;
Silver, diameter 42 mm, weight 29.1 g.