20 Pfennig

Herford's 1920 Notgeld issues belong to the second wave of municipal emergency currency — by this point German cities had been printing their own small-denomination scrip for nearly two years, filling the chronic shortage of low-value coinage that the Reichsbank simply could not address at scale. The Stadt Herford series is catalogued under both Grabowski and Vadelow references, which occasionally diverge on variety classification; the "b" suffix in Gra#H28.6b typically denotes a paper stock or watermark variant within the same design run.

The watermark is the detail worth noting — relatively few Kleingeldscheine at this denomination bothered with it, and its presence here suggests the municipality used commercially watermarked stock rather than commissioning a bespoke security paper.