1 000 000 Mark

Hamborn was an industrial city in the Ruhr — coal mines, steelworks, a working-class population paid weekly because monthly wages would lose value before they could be spent. When the Reichsbank failed to supply enough currency during the hyperinflation of 1922–23, municipalities across Germany issued their own emergency money, Notgeld, to meet payroll. Hamborn's million-mark note is a product of that payroll crisis, not a banking one.

The city was absorbed into Duisburg in 1929 and ceased to exist as an administrative entity, which means "Stadt Hamborn am Rhein" as an issuing authority had a remarkably short operational window.