25 Pfennig

This is a cooperative notgeld issue — six small Thuringian towns pooling resources to produce a single emergency note series rather than each commissioning their own. That arrangement was unusual even within the notgeld wave of 1917–1921, where municipal issuers typically acted independently. The towns involved — Hildburghausen, Eisfeld, Themar, Römhild, Heldburg, and Ummerstadt — all fell within the former Duchy of Saxe-Hildburghausen's historical territory, which likely made the administrative cooperation easier to organize.

Worth noting for collectors: the multi-issuer attribution creates ambiguity in some catalogs, where the note appears under Hildburghausen alone as the lead municipality.