A very nice piece. A typologically rarer variation of the breaking of the obverse legend.
Obverse: in the pearl rim the Grand Master's shield, in the outer rim the legend:
MA-GST-IOHI-S:P;
Reverse: in the pearl rim the shield of the Order, in the outer rim the legend:
DNORVM COIN PR;
Silver, diameter 20 mm, weight 1.15 g.