1 Mark

Passau's municipal notgeld of 1921 falls within the second wave of German emergency money — the so-called "Serienscheine" phase, when towns increasingly used small-denomination paper issues as a revenue stream and local souvenir trade rather than purely out of necessity. By 1921 the acute coin shortage of 1918–1919 had eased, but the market for collectible notgeld had its own momentum, and many Stadtrat issues were printed in deliberate series to exploit philatelic demand.

The DeNG reference places this within a numbered subseries, suggesting multiple design variants were issued simultaneously under the same municipal authority.