A very rare denomination of the 'three brothers' single-credit coin, particularly in the variety shown, with a different decoration under the characters.
In the specialist catalogue "Common Minting of the Three Brothers 1651-1662", by Marcin Grandowski, a variety with a rarity grade of R7-, which means 9-10 pieces known to the author.
Pieces with sheet flaws, but with elements of mint luster.
Recommended!