20 Heller Hinterbrühl

Hinterbrühl is a small village in Lower Austria, southeast of Vienna, best known today as the site of the Seegrotte — a flooded gypsum mine. In 1920, like hundreds of other Austrian municipalities, it issued its own small-denomination Notgeld in response to the acute coin shortage that followed the collapse of the Habsburg economy. The 20 Heller denomination was among the most common for village issues, intended purely for local retail use and theoretically redeemable once normal coinage returned.

The official seal was the only security measure — a practical acknowledgment that counterfeiting a 20 Heller municipal scrip was economically pointless.