"Notgeld (German for "emergency money" or "necessity money") refers to money issued by an institution in a time of economic or political crisis. The issuing institution ...
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is usually one without official sanction from the central government. This occurs usually when sufficient state-produced money is not available from the central bank. Most notably, notgeld generally refers to money produced in Germany and Austria during World War I and the Interbellum. Issuing institutions could be a town´s savings banks, municipality and private or state-owned firms. Nearly all issues contained an expiry date, after which time they were invalid. Issues without dates ordinarily had an expiry announced in a newspaper or at the place of issuance." - (en.wikipedia.org 16.07.2021)
