Hi /r/askhistorians! I stumbled across a stamp on a post card (not a paid stamp, this is like an ink stamp) referencing an organization called "Monda Ligo". Other than a few random Google Books results and Ebay listings, there is nothing I can find about this organization. The stamp says "Monda Ligo" inside of it, and includes an insignia that says "Correspondence & Exchange Club". The insignia includes two earths side by side with a letter in between. I can gather that it may have been a club devoted to stamp collecting, but that is about it. Does anyone know what Monda Ligo is??