1923
Weimar
The paper mark stops working. The Rentenmark of November restores a usable unit.

In 1923 the German mark lost practical use as a unit. War finance, the Ruhr, and a Reichsbank that created marks against Treasury bills drove the spiral.
Mid-November the Rentenmark stopped it: one trillion paper marks equaled one Rentenmark, and the press stopped financing the Treasury as before.