Denier - Boleslaus I the Brave unknown mint

Boleslaus I inherited the Polish duchy in 992 and was only crowned king in 1025, in the final weeks of his life — meaning this denier was struck under a ruler who was technically still a duke for most of the issue's production window. His mints remain unidentified with certainty, and the attribution to a specific workshop is still contested among Polish medieval numismatists. Kop#6 is among the earliest documented Polish coinage types, predating the establishment of any confirmed royal mint infrastructure.