| Country | Action | Action Date | Effective Date |
|---|
| ABYSSINIA | Signature | 25/09/1926 | |
| AFGHANISTAN | Accession | 09/11/1935 | |
| ALBANIA | Signature | 25/09/1926 | |
| ANTIGUA AND BARBUDA | Succession | 25/10/1988 | 01/11/1981 |
| Antilles | Extension | 01/01/1986 | 01/01/1986 |
| Aruba | Extension | 01/01/1986 | 01/01/1986 |
| AUSTRALIA | Signature | 25/09/1926 | |
| AUSTRALIA | Ratification | 18/06/1927 | |
| AUSTRIA | Signature | 25/09/1926 | |
| AUSTRIA | Ratification | 19/08/1927 | |
| AZERBAIJAN | Accession | 16/08/1996 | 16/08/1996 |
| BAHAMAS | Succession | 10/06/1976 | |
| BANGLADESH | Accession | 07/01/1985 | |
| BARBADOS | Succession | 22/07/1976 | |
| BELGIUM | Signature | 25/09/1926 | |
| BELGIUM | Ratification | 23/09/1927 | |
| BOLIVIA | Accession | 06/10/1983 | |
| BULGARIA | Signature | 25/09/1926 | |
| BULGARIA | Ratification | 09/03/1927 | |
| BURMA | Succession | 15/04/1940 | 01/04/1937 |
| BURMA | Reservation | 15/04/1940 | |
| CAMEROON | Succession | 07/03/1962 | |
| CANADA | Signature | 25/09/1926 | |
| CANADA | Ratification | 06/08/1928 | |
| CENTRAL AFRICAN REPUBLIC | Succession | 04/09/1962 | |
| CHILE | Accession | 20/06/1995 | |
| CHINA | Signature | 25/09/1926 | |
| CHINA | Ratification | 22/04/1937 | |
| CHINA | Declaration | 10/06/1997 | |
| CHINA | Communication | 19/10/1999 | |
| CHINA | Declaration | 19/10/1999 | |
| COLOMBIA | Signature | 25/09/1926 | |
| CONGO | Succession | 15/10/1962 | |
| COTE D'IVOIRE | Succession | 08/12/1961 | |
| CROATIA | Succession | 12/10/1992 | 08/10/1991 |
| CUBA | Signature | 25/09/1926 | |
| CUBA | Ratification | 06/07/1931 | |
| Curacao | Extension | 07/01/1928 | |
| CZECH REPUBLIC | Succession | 22/02/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Signature | 25/09/1926 | |
| CZECHOSLOVAKIA | Ratification | 10/10/1930 | |
| DAHOMEY | Succession | 04/04/1962 | |
| DENMARK | Signature | 25/09/1926 | |
| DENMARK | Ratification | 17/05/1927 | |
| DOMINICA, COMMONWEALTH OF | Succession | 17/08/1994 | 03/11/1978 |
| DOMINICAN REPUBLIC | Accession | 16/07/1928 | |
| ECUADOR | Accession | 26/03/1928 | |
| EGYPT | Accession | 25/01/1928 | |
| ESTONIA | Signature | 25/09/1926 | |
| ESTONIA | Ratification | 16/05/1929 | |
| FIJI | Succession | 12/06/1972 | |
| FINLAND | Signature | 25/09/1926 | |
| FINLAND | Ratification | 29/09/1927 | |
| FRANCE | Signature | 25/09/1926 | |
| FRANCE | Ratification | 28/03/1931 | |
| GERMAN DEMOCRATIC REPUBLIC | Declaration | 01/01/1905 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 22/12/1958 | |
| GERMANY | Signature | 25/09/1926 | |
| GERMANY | Ratification | 12/03/1929 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 01/01/1905 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/01/1953 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 20/07/1955 | |
| GHANA | Succession | 03/05/1963 | |
| GREECE | Signature | 25/09/1926 | |
| GREECE | Ratification | 04/07/1930 | |
| GUATEMALA | Accession | 11/11/1983 | |
| GUINEA | Succession | 30/03/1962 | |
| HAITI | Accession | 03/09/1927 | |
| HONG KONG SAR | Application | 10/06/1997 | |
| HUNGARY | Reservation | 16/04/1927 | |
| HUNGARY | Accession | 17/02/1933 | |
| INDIA | Signature | 25/09/1926 | |
| INDIA | Declaration | 25/09/1926 | |
| INDIA | Ratification | 18/06/1927 | |
| Indies | Extension | 07/01/1928 | |
| IRAQ | Accession | 18/01/1929 | |
| IRELAND, REPUBLIC OF | Accession | 18/06/1930 | |
| ISRAEL | Accession | 06/01/1955 | |
| ITALY | Signature | 25/09/1926 | |
| ITALY | Ratification | 25/08/1928 | |
| KAZAKHSTAN | Accession | 01/05/2008 | 01/05/2008 |
| LATVIA | Signature | 25/09/1926 | |
| LATVIA | Ratification | 09/07/1927 | |
| LIBERIA | Signature | 25/09/1926 | |
| LIBERIA | Ratification | 17/05/1930 | |
| LITHUANIA | Signature | 25/09/1926 | |
| MACEDONIA THE FYR OF | Succession | 18/01/1994 | 17/09/1991 |
| MALI | Succession | 02/02/1973 | |
| MAURITANIA | Accession | 06/06/1986 | |
| MEXICO | Accession | 08/09/1934 | |
| MONACO | Accession | 17/01/1928 | |
| MOROCCO | Succession | 11/05/1959 | |
| NETHERLANDS THE | Signature | 25/09/1926 | |
| NETHERLANDS THE | Ratification | 07/01/1928 | |
| NETHERLANDS THE | Declaration | 01/01/1986 | 01/01/1986 |
| NEW ZEALAND | Signature | 25/09/1926 | |
| NEW ZEALAND | Ratification | 18/06/1927 | |
| NICARAGUA | Accession | 03/09/1927 | |
| NIGER | Succession | 25/08/1961 | |
| NORWAY | Signature | 25/09/1926 | |
| NORWAY | Ratification | 10/09/1927 | |
| PANAMA | Signature | 25/09/1926 | |
| PARAGUAY | Accession | 27/09/2007 | 27/09/2007 |
| PERSIA | Signature | 25/09/1926 | |
| POLAND | Signature | 25/09/1926 | |
| POLAND | Ratification | 17/09/1930 | |
| PORTUGAL | Signature | 25/09/1926 | |
| PORTUGAL | Ratification | 04/10/1927 | |
| PORTUGAL | Communication | 21/10/1999 | |
| ROMANIA | Signature | 25/09/1926 | |
| ROMANIA | Ratification | 22/06/1931 | |
| SAINT LUCIA | Succession | 14/02/1990 | 22/02/1979 |
| SENEGAL | Succession | 02/05/1963 | |
| SERB-CROAT-SLOVENE STATE | Signature | 25/09/1926 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 28/09/1929 | |
| SEYCHELLES | Accession | 05/05/1992 | |
| SLOVAK REPUBLIC | Succession | 28/05/1993 | 01/01/1993 |
| SOLOMON ISLANDS | Succession | 03/09/1981 | |
| SOUTH AFRICA | Signature | 25/09/1926 | |
| SOUTH AFRICA | Ratification | 18/06/1927 | |
| South West Africa | Extension | 18/06/1927 | |
| SPAIN | Signature | 25/09/1926 | |
| SPAIN | Ratification | 12/09/1927 | |
| ST VINCENT AND THE GRENADINES | Accession | 09/11/1981 | |
| SUDAN | Accession | 15/09/1927 | |
| Surinam | Extension | 07/01/1928 | |
| SURINAME | Succession | 12/10/1979 | |
| SWEDEN | Signature | 25/09/1926 | |
| SWEDEN | Ratification | 17/12/1927 | |
| SWITZERLAND | Accession | 01/11/1930 | |
| SYRIA & GRAND LEBANON | Accession | 25/06/1931 | |
| TOGO | Succession | 27/02/1962 | |
| TURKEY | Accession | 24/07/1933 | |
| TURKMENISTAN | Accession | 01/05/1997 | |
| UNITED KINGDOM | Signature | 25/09/1926 | |
| UNITED KINGDOM | Ratification | 18/06/1927 | |
| UNITED KINGDOM | Notification | 10/06/1997 | |
| UNITED STATES OF AMERICA | Accession | 21/03/1929 | |
| UNITED STATES OF AMERICA | Reservation | 21/03/1929 | |
| URUGUAY | Signature | 25/09/1926 | |