| Country | Action | Action Date | Effective Date |
|---|
| Anguilla | Decision Resvd. | 20/08/1963 | |
| Antigua | Decision Resvd. | 20/08/1963 | |
| AUSTRIA | Signature | 15/06/1927 | |
| AUSTRIA | Ratification | 18/02/1929 | |
| Barbados | Extension | 15/10/1963 | |
| Bermuda | Decision Resvd. | 04/02/1963 | |
| BOSNIA AND HERZEGOVINA | Ratification | 02/06/1993 | 02/06/1993 |
| British Honduras | Extension | 15/10/1963 | |
| British Virgin Islands | Decision Resvd. | 22/08/1966 | |
| Brunei | Decision Resvd. | 03/08/1964 | |
| BULGARIA | Signature | 15/06/1927 | |
| BULGARIA | Ratification | 01/11/1930 | |
| CHILE | Signature | 15/06/1927 | |
| CHILE | Ratification | 08/10/1931 | |
| COLOMBIA | Signature | 15/06/1927 | |
| COLOMBIA | Ratification | 20/06/1933 | |
| CZECHOSLOVAKIA | Signature | 15/06/1927 | |
| CZECHOSLOVAKIA | Ratification | 17/01/1929 | |
| CZECHOSLOVAKIA | Withdrawal | 10/07/1980 | 10/07/1981 |
| DJIBOUTI | Accession | 03/08/1978 | |
| Dominica | Extension | 15/10/1963 | |
| ECUADOR | Signature | 15/06/1927 | |
| ECUADOR | Ratification | 05/02/1962 | |
| Falkland Islands | Extension | 08/05/1963 | |
| FRANCE | Signature | 15/06/1927 | |
| FRANCE | Ratification | 17/05/1948 | |
| GERMANY | Signature | 16/06/1927 | |
| GERMANY | Ratification | 23/01/1928 | |
| GERMANY FEDERAL REPUBLIC | Accession | 01/01/1905 | |
| Gibraltar | Decision Resvd. | 07/03/1963 | |
| Guernsey | Extension | 20/02/1931 | |
| HAITI | Signature | 15/01/1927 | |
| HAITI | Ratification | 19/04/1955 | |
| Hong Kong | Decision Resvd. | 04/02/1963 | |
| HUNGARY | Signature | 15/06/1927 | |
| HUNGARY | Ratification | 19/04/1928 | |
| Isle of Man | Extension | 20/02/1931 | |
| Jersey | Extension | 20/02/1931 | |
| LATVIA | Signature | 15/06/1927 | |
| LATVIA | Ratification | 29/11/1929 | |
| LITHUANIA | Signature | 15/06/1927 | |
| LITHUANIA | Ratification | 19/06/1931 | |
| LUXEMBOURG | Signature | 15/06/1927 | |
| LUXEMBOURG | Ratification | 16/04/1928 | |
| Malta | Extension | 21/05/1964 | |
| Montserrat | Decision Resvd. | 04/02/1963 | |
| NETHERLANDS THE | Ratification | 15/11/1965 | |
| NICARAGUA | Signature | 15/06/1927 | |
| NICARAGUA | Ratification | 12/04/1934 | |
| NORWAY | Ratification | 29/05/1961 | |
| PERU | Signature | 15/06/1927 | |
| PERU | Ratification | 08/11/1945 | |
| POLAND | Signature | 15/06/1927 | |
| POLAND | Ratification | 29/09/1948 | |
| ROUMANIA | Signature | 15/06/1927 | |
| ROUMANIA | Ratification | 28/06/1929 | |
| SLOVENIA | Ratification | 09/06/1992 | |
| SPAIN | Signature | 15/06/1927 | |
| SPAIN | Ratification | 29/09/1932 | |
| St Helena | Decision Resvd. | 08/02/1965 | |
| St Kitts Nevis Anguilla | Decision Resvd. | 20/08/1963 | |
| UNITED KINGDOM | Signature | 15/06/1927 | |
| UNITED KINGDOM | Signature | 16/06/1927 | |
| UNITED KINGDOM | Ratification | 20/02/1931 | |
| UNITED KINGDOM | Declaration | 20/02/1931 | |
| UNITED KINGDOM | Declaration | 20/08/1963 | |
| UNITED KINGDOM | Declaration | 21/05/1964 | |
| UNITED KINGDOM | Declaration | 03/08/1964 | |
| URUGUAY | Signature | 15/06/1927 | |
| URUGUAY | Ratification | 06/06/1933 | |
| URUGUAY | Withdrawal | 28/07/1978 | 28/07/1979 |
| YUGOSLAVIA | Signature | 15/06/1927 | |
| YUGOSLAVIA | Ratification | 30/09/1929 | |
| Zanzibar | Extension | 15/10/1963 | |