Denier Bracteate guziczkowy - unknown Prince Płock mint

Bracteates of this type — struck as thin, single-sided silver uniface pieces — were the dominant small denomination across the Piast duchies during the fragmentation period, when Masovia operated as an independent duchy under successive princes following the division of Polish territories. The "guziczkowy" designation refers to the button-like boss at the center of the die, a feature used to distinguish this subtype within Kopicki's classification.

Attribution to a specific ruler remains unresolved. Płock served as the Mazovian capital and its mint was active across multiple reigns in this period, complicating die-sequence analysis.