100 000 000 000 Mark Fleckenssparkasse

Horneburg is a small market town — a "Flecken" in Lower Saxon administrative terminology — in what was then the Prussian province of Hanover. Its savings bank, the Fleckenssparkasse Horneburg, issued this 100-billion-Mark note during the peak of the German hyperinflation, when municipal and savings institutions across the country were authorized to print emergency money (Notgeld) simply to keep commerce functioning. By late 1923, the Reichsbank could not print fast enough to meet demand.

Notes of this denomination became worthless within days of issue. The stabilization came in November 1923 with the introduction of the Rentenmark, at which point all hyperinflation-era paper was rendered void.