League of Nations – Passport Conferences 1920 and 1925
The League of Nations held two conferences about passports. Below you see their recommendation for a “passport standard”
Conference on Passports and Customs Formalities
October 15-21, 1920 in Paris.The League of Nations hosted a conference in Paris to address the problems of passports and customs formalities for international travelers.
Second International Passport Conference
May 12-18, 1926 in Geneva. The League of Nations hosted a second conference in Geneva on passport standardization to promote international travel.
Source: League of Nations – Photo Archive League of Nations – Passport Conferences 1920 and 1925