German 1 Mark Darlehnskassenschein (Loan Treasury Bill) from 1922.

Here's some information about this historical banknote:
Issuing Entity and Period: It was issued by the Reichsschuldenverwaltung (Reich Debt Administration) during the Weimar Republic era in Germany, specifically dated September 15, 1922.
Purpose: These "Darlehenskassenscheine" were a form of paper money issued between 1914 and 1922 to finance government expenses, particularly during and after World War I, and were guaranteed by loans on industrial and agricultural goods.
Not Legal Tender, but Accepted: While not technically legal tender, they were widely accepted as a de facto currency and functioned as a parallel currency alongside the Goldmark, especially before the hyperinflation period fully took hold in 1923.
Historical Context: The issuance of these notes is closely linked to the period of severe hyperinflation experienced by the Weimar Republic in the early 1920s, which significantly devalued the currency, including these Darlehnskassenscheine.
Collectible: highly collectible