| Year |
First Day |
Country |
Scott # |
Agency |
Conference |
Conference Dates |
Conference City |
| 1930 | 23-Apr | France | 256-257 | ILO | 48th Session of ILO Governing Body | 24-29 Apr 1930 | Paris |
 |
| 1930 | 5-Oct | Belgium | 222-224 | ILO | 50th Session of ILO Governing Body | 7-12 Oct 1930 | Brussels |
 |
| 1932 | 2-Feb | Switzerland | 210-215, C16-18 | LON | Conference for the Reduction and Limitation of Armaments | 2 Feb-23 Jul 1932 | Geneva |
 |
| 1932 | 2-Feb | Switzerland | 2O36-41 | LON | Conference for the Reduction and Limitation of Armaments | 2 Feb-23 Jul 1932 | Geneva |
 |
| 1932 | 2-Feb | Switzerland | 3O32-37 | LON | Conference for the Reduction and Limitation of Armaments | 2 Feb-23 Jul 1932 | Geneva |
 |
 |
| 1933 | 18-May | Canada | 202 | UPU | Preparatory Committee for 10th Congress | 18 May-28 Jun 1933 | Ottawa |
 |
| 1934 | 1-Feb | Egypt | 177-190 | UPU | 10th Universal Postal Congress | 1 Feb-20 Mar 1934 | Cairo |
 |
| 1937 | 6-Oct | Czechoslovakia | 236-238 | ILO | 81st Session of ILO Governing Body | 6-9 Oct 1937 | Prague |
   |
| 1938 | 1-Feb | Egypt | 228-230 | ITU | International Telecommunications Conference | 1 Feb-8 Apr 1938 | Cairo |
 |
| 1939 | 1-Apr | Argentina | 459-66 | UPU | 11th Universal Postal Congress | 1Apr -23 May 1939 | Buenos Aires |
 |
| 1939 | 12-May | Argentina | 467-468 | UPU | 11th Universal Postal Congress | 1Apr -23 May 1939 | Buenos Aires |
 |
