Very interesting and rare forgery or imitation from the era of the royal denarius of Bolesław II the Bold.
The coin is stylistically completely different, which is particularly visible in the royal portrait.
Obverse: crowned bust of the king with a sword raised in the air, to the left, no additional symbols behind the head
Reverse: gate with three towers, topped with spherical domes.
Silver, diameter 12 mm, weight 0.37 g