1 Groschen - John Ernest

Regenstein was a small, financially strained county in the Harz region whose counts spent much of the late sixteenth century in debt disputes with their neighbors and the Brunswick-Wolfenbüttel duchy. John Ernest — Johann Ernst — issued this groschen during a two-year window that coincided with protracted negotiations over the county's territorial obligations. The county was absorbed into Brunswick-Wolfenbüttel by 1670, making all Regenstein coinage terminal issues of a vanishing entity.

The Schröter-Denicke reference places this among a small cluster of types struck in quick succession, suggesting a single short minting episode rather than sustained production.