1 000 000 000 Mark

One of hundreds of Notgeld issues flooding the Rhineland in the autumn of 1923, this milliard-Mark note was authorized by the combined districts of Bonn and Sieg at the absolute peak of the German hyperinflation — the point at which the Reichsbank's own presses could not keep pace with demand, forcing municipal and district authorities across Prussia to commission local printers as a matter of basic economic function.

Rhenania-Druckerei was a Bonn commercial printer, not a security press. The watermarked paper was the primary concession to forgery deterrence. The Rentenmark stabilization of November 1923 rendered notes like this worthless within weeks of issue.