| Entry into force: | 6 December 1938 , in accordance with articles 14 and 15. |
| Registration: | 6 December 1938, No. 44871. |
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| Belgium | (July 21st, 1937) |
| Bulgaria | (September 7th, 1938) |
| Latvia | (May 4th, 1937) |
| Romania | (December 23rd, 1937) |
| Turkey | (March 19th, 1941) |
| Union of Soviet Socialist Republics | (September 20th, 1937) |
Austria | Chile (a) | Czechoslovakia2 | France | Greece | Italy | The Netherlands (for the Kingdom in Europe) | Poland | Spain | Switzerland | |
| Participant | Accession (a) |
| Yugoslavia | 8 Feb 1967 a |
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1. League of Nations, Treaty Series, vol. 193, p. 59.