Rare Brieg ducat.
Variety with the inscription FRATR: on the obverse.
In the specialized catalog 'Common coinage of three brothers 1651-1662', by Marcin Grandowski variety with rarity level of R6+, which means 11-15 pieces known to the author.
Attractive coin that exhibits plenty of mint luster.
Mounted.
Gold, diameter 23 mm, weight with mount 3.63 g