Heller

Oppeln, a Silesian ducal town under Piast succession during the mid-fifteenth century, issued municipal bracteate-style small silver denominations as the duchy fragmented among competing hereditary claims. The Heller was a German penny denomination that had spread eastward from its Swabian origins at Schwäbisch Hall, and by the mid-1400s was being struck by numerous Silesian municipalities exercising minting rights delegated — or simply assumed — during periods of ducal weakness.

Kop. 8681 places this issue within Kopicki's exhaustive Polish and Silesian corpus, though documentation on specific Oppeln municipal emissions of this period remains sparse even in specialist literature.