10 000 000 000 Mark

Singen-Hohentwiel was a mid-sized industrial town in Baden, and like hundreds of German municipalities in autumn 1923, it was forced to issue its own emergency currency — Notgeld — as the Reichsbank's printing output simply could not keep pace with hyperinflation. The ten-billion-mark denomination places this note squarely in the most acute phase of the crisis, October–November 1923, when denominations were climbing by orders of magnitude week to week.

The printer, Oberbadische Genossenschafts-Druckerei, was a regional cooperative press in Singen itself — a practical choice when shipping paper to distant printers had become logistically absurd at the pace required. The Reichsmark stabilization in mid-November 1923 rendered notes like this one obsolete almost immediately after issue.