Sigismund I the Old, 3 groschen 1539, Danzig - PCGS AU53

A beautiful circular piece. The coin is definitely rare in such condition.

Obverse: bust of the king in plate armor, cap, to the right, in the rim a legend beginning with the mint mark:
SIGIS-I-REX-POLO-DO-TO-PRVS;

Reverse: in line rim, legend with trilaterals at the numerals of the denomination and the date separated by a cartouche with the city coat of arms:
III/GROSS:AR/TRIP:CIVI/GEDANEN/15-39;