20 000 000 Mark

Siegkreis — a rural district east of Bonn, straddling the Sieg river — was one of hundreds of German administrative bodies forced into emergency currency production during the hyperinflation of 1923. By the time this twenty-million mark note was printed, that denomination was already losing ground to inflation faster than paper could move through the press. B. Kühlen in Mönchengladbach was a commercial printer, not a security printing house, and the coloured underprint here is a modest gesture toward forgery deterrence rather than a genuine technical barrier.

The Rentenmark reform of November 1923 rendered the entire series worthless within weeks of issue.