A very nice piece.
Typical sheet metal defects for this issue.
Obverse: in the pearl border a figure of a knight with a coat of arms on a shield, in the outer border a legend:
MO-ARG:PRO-CONFOE-BEL-FRI;
Reverse: crowned coat of arms of the Netherlands, on the sides the date 16-20, in the outer rim the legend:
CONCORDIA-RES-PARVAE-CRESCVNT-;