A nice piece, slightly deficient.
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 21 mm, weight 1.54 g.