Rare vintage of John Casimir ducat from Danzig.
Variety with REX written in full in the obverse legend.
Obverse: along the inner rim, crowned bust of the ruler, right, with the Order of the Golden Fleece on the chest
IOH•CAS•D•G•REX POL•& SUEC•M•D•L•R•P
Reverse: along the inner rim, a crowned coat of arms of Gdańsk in an oval cartouche held by two lions, above a branch in a wreath, between the lions' paws initials DL Daniel Lesse, lessee of the Gdańsk mint in the years 1650-1685
MON•AUREA CIVITAT•GEDANENS•1661
Diameter 25 mm, weight 3.46 g