Lithuania › Memel Territory • Unspecified ruling authority [solved]

Treaty of Versailles

SECTION X.

Memel.

Article 99.

Germany renounces in favour of the Principal Allied and Associated Powers all rights and title over the territories included between the Baltic, the north eastern frontier of East Prussia as defined in Article 28 of Part II (Boundaries of Germany) of the present Treaty and the former frontier between Germany and Russia.

----

https://en.wikipedia.org/wiki/Conference_of_Ambassadors

https://en.wikipedia.org/wiki/Klaip%C4%97da_Region

Between 1920-02-15 and 1923-01-15 territory was controlled by Allies/Entente represented by French.

https://en.numista.com/catalogue/index.php?e=memel&r=&st=all&cat=y&im1=&im2=&ru=&ie=&ca=3&no=&v=&a=&dg=&i=&b=&m=&f=&t=&t2=&w=&mt=&u=&g=&se=&c=&wi=&sw=

Nine banknotes issued by “High Commissioner Representative of the Allied Powers”.

I guess ruling authority was "Conference of Ambassadors", “League of Nations” or “Allied Powers”

numismaster uses term “Memel - French Administration - Post WW I (No Date)”

https://numismaster.com/?id=1728449&fromsearch=true#iosfirsthighlight

Added “Conference of Ambassadors”