100 000 000 Mark

Düsseldorf's municipal administration was among dozens of German cities forced to print emergency currency in 1923 as hyperinflation rendered Reichsbank notes obsolete almost the moment they were issued. By the time this 100-million Mark note was authorized, the denomination — incomprehensible even a year earlier — had become functionally inadequate within weeks of printing. Cities, counties, and private firms all issued their own Notgeld simply to keep payroll moving.

The DeNG 12 reference places this within the specialized cataloging of German notgeld issues; the suffix "y" typically denotes a paper variant within the series. Municipal issues from this period were printed locally and often in small runs, making complete type collections genuinely difficult to assemble.