Notgeld, emergency money, is the name of money issued by an institution not authorised for money emission. This occurs usually when money is not available from the central bank. The best known emergency money emissions occurred in Germany and Austria-Hungary around the end of the first World War. (via Wikipedia).
Here is a massive collection of old Notgeld, some of which was designed at the Bauhaus. We love the huge variety of type, pattern & colour.