A beautiful mint piece.
The coin is definitely rare in such condition.
Obverse: coat of arms of Gdansk in a cartouche supported by two lions, in a rope border, above the cartouche an abbreviation of the date -2-3/4-, in the border a legend beginning with the mint mark:
-MONETA-CIVIT-GEDANENSIS-;
Reverse: bust of Sigismund III Vasa wearing a crown to the right, with the Order of the Golden Fleece on a chain of 7 flints, wearing armor and a cloak studded with jewels, in a string border, on the sides of the bust the denomination marking I-6, in the rim the legend:
SIGIS-III-D:G:REX-POL-M:D:L-R:PR-;