100 Mark overstamp on 5 Mark

Gera's decision to overprint existing 5 Mark stock at 100 Mark was a direct response to the accelerating inflation of 1922, when municipal authorities across Thuringia were scrambling to produce emergency Notgeld of higher denominations faster than conventional printing allowed. Reusing lower-denomination sheets and stamping a new value over them was quicker and cheaper than commissioning fresh designs — the watermarked paper provided a ready-made substrate with at least nominal security.

The overprint itself is the document. What you are looking at is a municipality improvising monetary infrastructure in real time.