Heller

Krosno, a royal city in Lesser Poland, held minting rights intermittently during the fifteenth century as part of the broader Polish crown's pragmatic delegation of small-denomination coinage production to regional centers. The heller denomination itself was borrowed from the German monetary tradition — originating in Schwäbisch Hall — and circulated across Central European trade routes where fractional silver was chronically short.

The nearly five-decade attribution window reflects genuine uncertainty in the numismatic literature rather than extended production; precise dating of Polish civic hellers from this period remains difficult without documentary corroboration.