| Country | Action | Action Date | Effective Date |
|---|
| ARGENTINE REPUBLIC | Signature | 06/10/1921 | |
| AUSTRIA | Signature | 06/10/1921 | |
| AUSTRIA | Ratification | 15/12/1926 | |
| BELGIUM | Signature | 06/10/1921 | |
| BELGIUM | Ratification | 28/07/1923 | |
| BRAZIL | Signature | 06/10/1921 | |
| BRAZIL | Ratification | 14/04/1954 | |
| BULGARIA | Signature | 06/10/1921 | |
| BULGARIA | Ratification | 27/08/1925 | |
| CAMEROON | Accession | 07/10/1970 | |
| CANADA | Signature | 06/10/1921 | |
| CANADA | Ratification | 21/02/1923 | |
| CHILE | Signature | 06/10/1921 | |
| CHINA | Accession | 20/05/1977 | |
| CZECH REPUBLIC | Accession | 13/01/1993 | |
| CZECHOSLOVAKIA | Accession | 21/06/1922 | |
| DENMARK | Signature | 06/10/1921 | |
| DENMARK | Ratification | 10/02/1923 | |
| DENMARK | Re-Application | 01/10/1953 | |
| FINLAND | Signature | 06/10/1921 | |
| FINLAND | Ratification | 31/08/1923 | |
| FRANCE | Signature | 06/10/1921 | |
| FRANCE | Ratification | 01/08/1928 | |
| GERMAN DEMOCRATIC REPUBLIC | Notification | 12/02/1974 | |
| GERMAN DEMOCRATIC REPUBLIC | Accession | 28/03/1974 | |
| GERMANY | Signature | 06/10/1921 | |
| GERMANY | Ratification | 30/01/1928 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 01/01/1905 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/01/1953 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/10/1953 | |
| HUNGARY | Signature | 06/10/1921 | |
| HUNGARY | Ratification | 14/08/1925 | |
| INDIA | Accession | 11/01/1957 | |
| INDONESIA | Accession | 30/09/1960 | |
| IRAN | Accession | 25/02/1975 | |
| ITALY | Signature | 06/10/1921 | |
| ITALY | Ratification | 07/08/1924 | |
| JAPAN | Signature | 06/10/1921 | |
| JAPAN | Ratification | 30/12/1924 | |
| KOREA DEMOCRATIC PEOPLE'S REPUBLIC OF | Accession | 07/05/1982 | |
| KOREA REPUBLIC OF | Accession | 28/07/1959 | |
| MEXICO | Signature | 06/10/1921 | |
| MEXICO | Ratification | 15/04/1927 | |
| NETHERLANDS THE | Accession | 01/01/1929 | |
| NORWAY | Signature | 06/10/1921 | |
| NORWAY | Ratification | 03/08/1923 | |
| PAKISTAN | Accession | 12/07/1973 | |
| PERU | Signature | 06/10/1921 | |
| PERU | Ratification | 26/07/1937 | |
| POLAND | Accession | 12/05/1925 | |
| PORTUGAL | Signature | 06/10/1921 | |
| PORTUGAL | Ratification | 17/06/1926 | |
| ROUMANIA | Signature | 06/10/1921 | |
| ROUMANIA | Ratification | 11/02/1926 | |
| SERB-CROAT-SLOVENE STATE | Signature | 06/10/1921 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 10/11/1929 | |
| SIAM | Signature | 06/10/1921 | |
| SIAM | Ratification | 25/11/1950 | |
| SINGAPORE | Accession | 20/06/1994 | |
| SLOVAK REPUBLIC | Accession | 13/01/1993 | |
| SOUTH AFRICA | Accession | | 31/07/1964 |
| SOVIET UNION | Accession | 12/08/1925 | |
| SOVIET UNION | Notification | 14/05/1976 | |
| SPAIN | Signature | 06/10/1921 | |
| SPAIN | Ratification | 31/12/1926 | |
| SWEDEN | Signature | 06/10/1921 | |
| SWEDEN | Ratification | 16/02/1923 | |
| SWITZERLAND | Signature | 06/10/1921 | |
| SWITZERLAND | Ratification | 05/02/1923 | |
| UNITED ARAB REPUBLIC | Accession | 02/11/1962 | |
| UNITED KINGDOM | Signature | 06/10/1921 | |
| UNITED KINGDOM | Ratification | 21/02/1923 | |
| UNITED KINGDOM | Re-Application | 01/01/1953 | |
| UNITED STATES OF AMERICA | Signature | 06/10/1921 | |
| UNITED STATES OF AMERICA | Ratification | 24/10/1923 | |
| URUGUAY | Signature | 06/10/1921 | |
| URUGUAY | Ratification | 02/12/1925 | |
| VENEZUELA | Accession | 18/11/1960 | |