20 Heller Nöchling

Nöchling is a small rural municipality in Lower Austria, and this 20 Heller note is a product of the Notgeld emergency — the post-WWI collapse of the Austro-Hungarian monetary system that forced thousands of Austrian communes to print their own fractional currency between 1919 and 1921. The federal government simply could not supply enough small-denomination coinage to keep local commerce functioning.

Signed by Leop. Wimmer, almost certainly the Bürgermeister at the time. Municipal officials rather than bank officers authenticated these issues, which tells you everything about how local and improvised the whole system was.