50 000 000 000 Mark Landesbank der Rheinprovinz

The Landesbank der Rheinprovinz was one of dozens of regional and municipal institutions that stepped into the vacuum left by the Reichsbank's inability to supply adequate currency during the hyperinflation peak of late 1923. This 50 billion Mark note was printed by J. P. Bachem in Köln — a commercial press better known for Catholic publishing than emergency currency production, which tells you something about how desperate the scramble for print capacity had become by that autumn.

Denominations like this became obsolete within weeks of issue as the inflation curve made even billion-Mark figures inadequate. The Rentenmark stabilization in November 1923 ended the series abruptly.