5 000 000 000 000 Mark

Buer in Westphalia was one of hundreds of German municipalities forced to print its own emergency currency during the hyperinflation of 1923, when the Reichsbank's supply of official notes simply could not keep pace with denominations that were doubling within days. This five trillion Mark note — issued when that sum was roughly equivalent to a loaf of bread — came near the terminal phase of the inflation, after the government had already lost practical control of the money supply to regional and municipal issuers.

The DeNG reference places this within a documented Buer series, but municipal Notgeld at these denominations was typically printed on short notice with minimal security features, and overprinting errors or typographical inconsistencies across the run are not uncommon.