1 Prague Groschen Counterstamped

Isny, a small imperial city in what is now Baden-Württemberg, lacked minting rights for original coinage but exercised the practical authority to validate foreign silver in local circulation. Counterstamping incoming Prague Groschen — the dominant trade coin of Bohemia under the later Luxembourg rulers — was a municipal declaration that the piece had been inspected and accepted at a set local value. The Krusy I3,5 attribution places this practice within a documented but sparsely surviving group.

Prague Groschen of this period were struck under Wenceslaus IV, whose reign saw repeated monetary debasements that made official validation by receiving cities commercially necessary.