The City State of Memel, now called Klaipeda, in present day Lithuania, was, up until the end of WWI in Prussia. Under the treaty of Versailles, it became a league of nations mandate, administrated by the French until in 1923, Lithuania occupied it and it became part of that country.
Monetary unit : 1 Mark = 100 Pfennig
The note above is the 10 Mark note from 1922, the period of French administration. the reverse of the note has a lighthouse and people in land / sea scenes.
Notgeld : German for "emergency money" or "necessity money", is the name of money issued by an institution not authorized 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 around the end of the First World War, which is why the German term is used. Issuing institutions could be e.g. town savings banks, municipalities, private and state-owned firms. It was therefore not legal tender, but rather a mutually-accepted means of payment in a particular locale or site. Notgeld is different from occupation money that is issued by an occupying army during a war.