A nice piece, very well struck.
Obverse: in the pearl rim the Grand Master's shield, in the outer rim the legend:
MAGS-T MIC-HAEL-PRIM;
Reverse: in the pearl rim the monastic shield, in the outer rim the legend:
MONE-TA-DN-ORVM-PRVC;
Silver, diameter 20.3 mm, weight 1.63 g.