| Country | Action | Action Date | Effective Date |
|---|
| ALBANIA | Signature | 10/07/1964 | |
| ALGERIA | Signature | 10/07/1964 | |
| ALGERIA | Approval | 12/06/1968 | |
| Antigua | Signature | 10/07/1964 | |
| Antigua | Approval | 06/03/1968 | |
| Antilles And Suriname | Signature | 10/07/1964 | |
| Antilles And Suriname | Approval | 08/08/1969 | |
| ARGENTINE REPUBLIC | Signature | 10/07/1964 | |
| ARGENTINE REPUBLIC | Approval | 23/06/1967 | |
| AUSTRIA | Ratification | 10/07/1964 | |
| AUSTRIA | Approval | 23/12/1965 | |
| BARBADOS | Accession | 13/09/1967 | |
| BELGIUM | Signature | 10/07/1964 | |
| BELGIUM | Approval | 04/11/1965 | |
| Bermuda | Signature | 10/07/1964 | |
| Bermuda | Approval | 06/03/1968 | |
| BOLIVIA | Signature | 10/07/1964 | |
| BRAZIL | Signature | 10/07/1964 | |
| BRAZIL | Approval | 08/08/1969 | |
| British Antarctic Territory | Signature | 10/07/1964 | |
| British Antarctic Territory | Approval | 06/03/1968 | |
| British Honduras | Signature | 10/07/1964 | |
| British Honduras | Approval | 06/03/1968 | |
| British Virgin Islands | Signature | 10/07/1964 | |
| British Virgin Islands | Approval | 06/03/1968 | |
| BURMA | Signature | 10/07/1964 | |
| BURMA | Approval | 01/07/1969 | |
| BURUNDI | Signature | 10/07/1964 | |
| BURUNDI | Approval | 09/05/1969 | |
| BYELORUSSIA S S R | Signature | 10/07/1964 | |
| CAMBODIA | Signature | 10/07/1964 | |
| CAMBODIA | Approval | 11/08/1969 | |
| CAMEROON | Signature | 10/07/1964 | |
| CAMEROON | Approval | 23/12/1968 | |
| CANADA | Signature | 10/07/1964 | |
| Cayman Islands | Signature | 10/07/1964 | |
| Cayman Islands | Approval | 06/03/1968 | |
| CENTRAL AFRICAN REPUBLIC | Signature | 10/07/1964 | |
| CENTRAL AFRICAN REPUBLIC | Approval | 26/07/1968 | |
| CHAD | Signature | 10/07/1964 | |
| Channel Islands | Signature | 10/07/1964 | |
| Channel Islands | Approval | 02/08/1966 | |
| CHILE | Signature | 10/07/1964 | |
| COLOMBIA | Signature | 10/07/1964 | |
| CONGO, REPUBLIC OF | Signature | 10/07/1964 | |
| CONGO, REPUBLIC OF | Approval | 07/09/1966 | |
| COSTA RICA | Signature | 10/07/1964 | |
| CUBA | Signature | 10/07/1964 | |
| CYPRUS | Signature | 10/07/1964 | |
| CYPRUS | Approval | 13/01/1969 | |
| CZECHOSLOVAKIA | Signature | 10/07/1964 | |
| CZECHOSLOVAKIA | Approval | 20/05/1966 | |
| DAHOMEY | Signature | 10/07/1964 | |
| DAHOMEY | Approval | 13/01/1967 | |
| DENMARK | Signature | 10/07/1964 | |
| DENMARK | Ratification | 23/12/1965 | |
| Dominica | Signature | 10/07/1964 | |
| Dominica | Approval | 06/03/1968 | |
| ECUADOR | Accession | 30/09/1969 | 11/11/1969 |
| EL SALVADOR | Signature | 10/07/1964 | |
| Falkland Island Dependencies | Signature | 10/07/1964 | |
| Falkland Island Dependencies | Approval | 06/03/1968 | |
| Falkland Islands | Signature | 10/07/1964 | |
| Falkland Islands | Approval | 06/03/1968 | |
| Fiji | Signature | 10/07/1964 | |
| Fiji | Approval | 06/03/1968 | |
| FIJI | Accession | 28/04/1971 | |
| FINLAND | Signature | 10/07/1964 | |
| FINLAND | Ratification | 17/12/1965 | |
| FRANCE | Signature | 10/07/1964 | |
| FRANCE | Approval | 22/01/1966 | |
| French O/seas Postal & Telecom Office Terr. | Signature | 10/07/1964 | |
| French O/seas Postal & Telecom Office Terr. | Approval | 22/01/1966 | |
| GABON | Signature | 10/07/1964 | |
| GABON | Approval | 27/01/1967 | |
| GERMANY | Signature | 10/07/1964 | |
| GERMANY | Approval | 27/06/1966 | |
| GERMANY | Declaration | 27/06/1966 | |
| GHANA | Signature | 10/07/1964 | |
| GHANA | Approval | 17/11/1966 | |
| Gibraltar | Signature | 10/07/1964 | |
| Gibraltar | Approval | 06/03/1968 | |
| GREECE | Signature | 10/07/1964 | |
| GREECE | Approval | 08/05/1968 | |
| Grenada | Signature | 10/07/1964 | |
| Grenada | Approval | 06/03/1968 | |
| GUINEA | Signature | 10/07/1964 | |
| GUINEA | Approval | 05/09/1966 | |
| GUYANA | Accession | | 22/03/1967 |
| Hong Kong | Signature | 10/07/1964 | |
| Hong Kong | Approval | 06/03/1968 | |
| HUNGARY | Signature | 10/07/1964 | |
| HUNGARY | Approval | 02/05/1967 | |
| ICELAND | Signature | 10/07/1964 | |
| ICELAND | Ratification | 10/08/1965 | |
| INDIA | Signature | 10/07/1964 | |
| INDIA | Approval | 08/11/1966 | |
| INDONESIA | Signature | 10/07/1964 | |
| IRAN | Signature | 10/07/1964 | |
| IRAN | Approval | 28/08/1968 | |
| IRAQ | Signature | 10/07/1964 | |
| IRAQ | Approval | 22/09/1967 | |
| IRELAND, REPUBLIC OF | Signature | 10/07/1964 | |
| IRELAND, REPUBLIC OF | Ratification | 04/03/1966 | |
| Isle of Man | Signature | 10/07/1964 | |
| Isle of Man | Approval | 02/08/1966 | |
| ITALY | Signature | 10/07/1964 | |
| ITALY | Approval | 12/07/1968 | |
| IVORY COAST | Signature | 10/07/1964 | |
| IVORY COAST | Approval | 28/10/1965 | |
| JAMAICA | Signature | 10/07/1964 | |
| JAMAICA | Approval | 08/11/1968 | |
| JAPAN | Signature | 10/07/1964 | |
| JAPAN | Approval | 22/07/1965 | |
| JORDAN | Signature | 10/07/1964 | |
| KENYA | Accession | 26/04/1968 | |
| KUWAIT | Signature | 10/07/1964 | |
| KUWAIT | Approval | 16/08/1967 | |
| Land Berlin | Extension | 27/06/1966 | |
| LAOS | Signature | 10/07/1964 | |
| LAOS | Approval | 25/09/1967 | |
| LEBANON | Signature | 10/07/1964 | |
| LIBYA | Signature | 10/07/1964 | |
| LIBYA | Approval | 21/04/1969 | |
| LIECHTENSTEIN | Signature | 10/07/1964 | |
| LIECHTENSTEIN | Approval | 05/10/1967 | |
| LUXEMBOURG | Signature | 10/07/1964 | |
| LUXEMBOURG | Approval | 29/12/1965 | |
| MALAGASY REPUBLIC | Signature | 10/07/1964 | |
| MALAGASY REPUBLIC | Approval | 25/08/1965 | |
| MALAWI | Accession | 25/10/1966 | |
| MALAYSIA | Signature | 10/07/1964 | |
| MALAYSIA | Approval | 22/02/1969 | |
| MALI | Signature | 10/07/1964 | |
| MALI | Ratification | 18/12/1965 | |
| MALTA | Accession | 04/06/1968 | |
| MAURITANIA | Accession | | 22/03/1967 |
| Mauritius | Signature | 10/07/1964 | |
| Mauritius | Approval | 06/03/1968 | |
| MAURITIUS | Accession | 25/07/1969 | |
| MONACO | Signature | 10/07/1964 | |
| MONACO | Approval | 30/09/1968 | |
| MONGOLIA | Signature | 10/07/1964 | |
| MONGOLIA | Approval | 08/04/1968 | |
| Montserrat | Signature | 10/07/1964 | |
| Montserrat | Approval | 06/03/1968 | |
| MOROCCO | Signature | 07/04/1967 | |
| NETHERLANDS THE | Signature | 10/07/1964 | |
| NETHERLANDS THE | Approval | 08/08/1969 | |
| NICARAGUA | Signature | 10/07/1964 | |
| NIGER | Signature | 10/07/1964 | |
| NIGER | Approval | 04/02/1966 | |
| NIGERIA | Signature | 10/07/1964 | |
| NIGERIA | Approval | 18/01/1967 | |
| NORWAY | Signature | 10/07/1964 | |
| NORWAY | Approval | 01/12/1965 | |
| Overseas Territories | Signature | 10/07/1964 | |
| Overseas Territories | Approval | 06/03/1968 | |
| PAKISTAN | Signature | 10/07/1964 | |
| PAKISTAN | Approval | 19/12/1966 | |
| PARAGUAY | Signature | 10/07/1964 | |
| Pitcairn,Henderson,Ducie & Oeno Islands | Signature | 10/07/1964 | |
| Pitcairn,Henderson,Ducie & Oeno Islands | Approval | 06/03/1968 | |
| POLAND | Signature | 10/07/1964 | |
| POLAND | Approval | 14/09/1967 | |
| PORTUGAL | Signature | 10/07/1964 | |
| PORTUGAL | Approval | 07/09/1968 | |
| Portugal, Provinces In West Africa | Accession | 20/11/1968 | |
| Provs in E.Africa, Asia and Oceania | Accession | 20/11/1968 | |
| QATAR | Accession | 31/01/1969 | |
| ROMANIA | Signature | 10/07/1964 | |
| ROMANIA | Approval | 28/04/1969 | |
| RWANDA | Signature | 10/07/1964 | |
| SAN MARINO | Signature | 10/07/1964 | |
| SAN MARINO | Approval | 11/10/1967 | |
| SAUDI ARABIA | Signature | 10/07/1964 | |
| SENEGAL | Signature | 10/07/1964 | |
| SENEGAL | Approval | 26/09/1967 | |
| Seychelles | Signature | 10/07/1964 | |
| Seychelles | Approval | 06/03/1968 | |
| SIERRA LEONE | Signature | 10/07/1964 | |
| SIERRA LEONE | Approval | 24/08/1967 | |
| SINGAPORE | Accession | 08/01/1966 | |
| SOMALIA | Signature | 10/07/1964 | |
| SOMALIA | Approval | 27/05/1968 | |
| SOVIET UNION | Signature | 10/07/1964 | |
| SPAIN | Signature | 10/07/1964 | |
| SPAIN | Approval | 09/11/1966 | |
| Spain, Territories In Africa | Signature | 10/07/1964 | |
| Spain, Territories In Africa | Approval | 09/11/1966 | |
| St Helena And Dependencies | Signature | 10/07/1964 | |
| St Helena And Dependencies | Approval | 06/03/1968 | |
| St Kitts Nevis Anguilla | Signature | 10/07/1964 | |
| St Kitts Nevis Anguilla | Approval | 06/03/1968 | |
| St Lucia | Signature | 10/07/1964 | |
| St Lucia | Approval | 06/03/1968 | |
| St Vincent | Signature | 10/07/1964 | |
| St Vincent | Approval | 06/03/1968 | |
| SWAZILAND | Accession | 14/10/1969 | 07/11/1969 |
| SWEDEN | Signature | 10/07/1964 | |
| SWEDEN | Approval | 13/12/1966 | |
| SWITZERLAND | Signature | 10/07/1964 | |
| SWITZERLAND | Approval | 04/02/1966 | |
| SYRIA | Signature | 10/07/1964 | |
| SYRIA | Approval | 18/11/1966 | |
| TAIWAN | Signature | 10/07/1964 | |
| TAIWAN | Approval | 06/09/1966 | |
| TANGANYIKA AND ZANZIBAR | Signature | 10/07/1964 | |
| THAILAND | Signature | 10/07/1964 | |
| THAILAND | Approval | 10/05/1966 | |
| TOGO | Signature | 10/07/1964 | |
| TOGO | Approval | 28/08/1967 | |
| Tonga | Signature | 10/07/1964 | |
| Tonga | Approval | 06/03/1968 | |
| TRINIDAD AND TOBAGO | Signature | 10/07/1964 | |
| TRINIDAD AND TOBAGO | Approval | 14/06/1968 | |
| TUNISIA | Signature | 10/07/1964 | |
| TUNISIA | Approval | 13/09/1966 | |
| TURKEY | Signature | 10/07/1964 | |
| TURKEY | Approval | 08/09/1970 | |
| UGANDA | Signature | 10/07/1964 | |
| UGANDA | Approval | 29/12/1965 | |
| UKRAINE | Signature | 10/07/1964 | |
| UNITED ARAB REPUBLIC | Signature | 10/07/1964 | |
| UNITED ARAB REPUBLIC | Approval | 30/06/1967 | |
| UNITED KINGDOM | Signature | 10/07/1964 | |
| UNITED KINGDOM | Approval | 02/08/1966 | |
| UPPER VOLTA | Signature | 10/07/1964 | |
| UPPER VOLTA | Approval | 04/02/1967 | |
| URUGUAY | Signature | 10/07/1964 | |
| VATICAN CITY | Signature | 10/07/1964 | |
| VATICAN CITY | Approval | 22/04/1968 | |
| VENEZUELA | Signature | 10/07/1964 | |
| VENEZUELA | Approval | 12/09/1969 | |
| VIETNAM | Signature | 10/07/1964 | |
| VIETNAM | Approval | 05/06/1967 | |
| YEMEN | Signature | 10/07/1964 | |
| YEMEN, PEOPLES'S DEMOCRATIC REPUBLIC OF | Accession | 28/06/1968 | |
| YUGOSLAVIA | Signature | 10/07/1964 | |
| YUGOSLAVIA | Approval | 15/11/1966 | |
| ZAIRE | Signature | 10/07/1964 | |