Denar - Jan II Kazimierz Poznań mint

Jan II Kazimierz's denar issues from Poznań fall within one of the most turbulent stretches in Polish monetary history. The early 1650s saw the Commonwealth's coinage system under severe strain — the Swedish invasion known as the Deluge was still two years away, but the concurrent Cossack uprisings and Russo-Polish War were already draining the treasury. Denars of this period were chronically debased in practice even when nominally silver, and the Poznań mint itself operated under lease arrangements that gave private contractors considerable latitude over actual metal content.

Kop#1536 and Kop#1537 represent consecutive-year varieties distinguished primarily by die differences documented by Kopicki. Both are scarce in any condition — the denomination was the lowest struck, circulated hard, and was melted or lost at rates that dwarf the larger nominały of the same reign.