A very nice, glossy piece.
The legendary variety PRVS M.
Obverse: bust facing right
SIGIS:III:D:G:REX:POL:M:D:LI:RVS:PRVS:M
Reverse: a five-field coat of arms under the crown, in the center a small shield with the coat of arms of the Vasa
SAM:LIV:NEC:N:SV:GOT:VAN:Q:HRI:R