Denier Bracteate guziczkowy - unknown Prince Płock mint

Bracteate coinage in Mazovia reflects a broader Central European tradition of thin, single-sided silver pieces that dominated regional circulation through much of the thirteenth and fourteenth centuries. Płock, as the principal seat of the Mazovian Piasts during this period, served as the most likely production point for this type, though attribution remains contested — the "unknown Prince" designation signals that numismatists have not reached consensus on which of several rulers sharing the Płock line commissioned the issue. Kopicki's reference number places it within a cluster of types sharing the guziczkowy ("button") classification, distinguished by a specific relief characteristic rather than any dynastic identification.