A nice piece with well-preserved details.
Variant with PRVS MAS in the obverse legend.
Obverse: in a pearl rim, a royal half-figure wearing a four-cornered crown with 5 rosette-shaped jewels in an open rim, with jewels on the bails, surmounted by a royal apple; wearing a lace collar and armor, wearing a sash, with the Order of the Golden Fleece suspended from a chain of 5 flints; holding a royal apple with two bands of jewels in the shape of rosettes and a sword; facing right; in the outer rim a legend punctuated by the Sas coat of arms in a simple shield of arms:
-VLADIS(laus)-IIII-D(ei):G(ratia)-REX-PO(loniae)--M(agnus)-D(ux)-LIT(huanie)-RVS(siae)-PRVS(siae)-MAS(oviae);
Reverse: crowned in a pearl rim, with a four-cornered crown, with 5 fleurons, with numerous jewels in an open rim; a nine-field shield with the coats of arms of the Crown, the Grand Duchy of Lithuania, Sweden, the Folkung, and the coat of arms of the Snopes of the Vasa dynasty, with labrys on the sides, surrounded by a chain of 20 chairs, with the Order of the Golden Fleece; between the shield and the chain initials I-I of Jacob Jakobson and the date 16-34; in the outer rim a legend punctuated by the Order:
-SAM(ogitiae)-LIV(oniaeque)-NE(c)-NO-SVE(corum)--GOT(horum)-VAND(alorum):Q(ue)-H(ae)R(editarius)-REX-;
Silver, diameter 44 mm, weight 28.41 g.