20 000 000 Mark

Heilbronn's 20-million Mark note dates from the acute phase of the German hyperinflation — by August 1923, the Reichsbank could no longer supply enough currency to meet payroll demands, and municipalities across the country were authorized to issue their own emergency Notgeld to cover the shortfall. Carl Rembold A.-G. was a local commercial printer, not a security printer, and that distinction matters: the notes were produced quickly, with whatever materials were available, and quality control was not the priority.

The denomination itself tells the story. At the rate the mark was collapsing, 20 million would buy a loaf of bread for roughly a week before the figure became meaningless.