| Country | Action | Action Date | Effective Date |
|---|
| Aden Colony | Extension | | 15/05/1957 |
| Aden Protectorate | Extension | | 15/05/1957 |
| Antigua | Extension | | 15/05/1957 |
| AUSTRALIA | Signature | 14/12/1956 | |
| AUSTRALIA | Ratification | 26/06/1957 | |
| Bahamas | Extension | | 15/05/1957 |
| Barbados | Extension | | 15/05/1957 |
| BELGIUM | Signature | 13/12/1956 | |
| BELGIUM | Ratification | 01/07/1957 | |
| Bermuda | Extension | | 15/05/1957 |
| British Guiana | Extension | | 15/05/1957 |
| British Honduras | Extension | | 15/05/1957 |
| British Virgin Islands | Extension | | 15/05/1957 |
| Brunei | Extension | | 15/05/1957 |
| CANADA | Signature | 15/12/1956 | |
| CANADA | Ratification | 25/06/1957 | |
| Cayman Islands | Extension | | 15/05/1957 |
| CHINA | Signature | 14/12/1956 | |
| CHINA | Declaration | 14/12/1956 | |
| CHINA | Ratification | 19/06/1957 | |
| CUBA | Signature | 13/12/1956 | |
| CUBA | Ratification | 28/06/1957 | |
| Cyprus | Extension | | 15/05/1957 |
| CZECHOSLOVAKIA | Signature | 14/12/1956 | |
| CZECHOSLOVAKIA | Reservation | 14/12/1956 | |
| CZECHOSLOVAKIA | Statement | 14/12/1956 | |
| CZECHOSLOVAKIA | Ratification | 27/05/1957 | |
| Dominica | Extension | | 15/05/1957 |
| DOMINICAN REPUBLIC | Signature | 14/12/1956 | |
| DOMINICAN REPUBLIC | Ratification | 01/07/1957 | |
| DOMINICAN REPUBLIC | Declaration | 01/07/1957 | |
| Falkland Island Dependencies | Extension | | 15/05/1957 |
| Falkland Islands | Extension | | 15/05/1957 |
| Fiji | Extension | | 15/05/1957 |
| FRANCE | Signature | 13/12/1956 | |
| FRANCE | Ratification | 31/12/1957 | |
| GERMANY FEDERAL REPUBLIC | Signature | 14/12/1956 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 24/07/1958 | |
| Gibraltar | Extension | | 15/05/1957 |
| GREECE | Signature | 14/12/1956 | |
| Grenada | Extension | | 15/05/1957 |
| HAYTI | Signature | 12/12/1956 | |
| HAYTI | Ratification | 06/02/1958 | |
| Hong Kong | Extension | | 15/05/1957 |
| HUNGARY | Accession | 29/03/1957 | |
| HUNGARY | Reservation | 29/03/1957 | |
| INDONESIA | Accession | 21/02/1958 | |
| IRELAND, REPUBLIC OF | Accession | 13/10/1958 | |
| Jamaica | Extension | | 15/05/1957 |
| JAPAN | Signature | 11/12/1956 | |
| JAPAN | Ratification | 24/06/1957 | |
| Kenya | Extension | | 15/05/1957 |
| LEBANON | Signature | 14/12/1956 | |
| Leeward Islands | Extension | | 15/05/1957 |
| Mauritius | Extension | | 15/05/1957 |
| MEXICO | Signature | 14/12/1956 | |
| MEXICO | Ratification | 25/11/1957 | |
| Montserrat | Extension | | 15/05/1957 |
| NETHERLANDS THE | Signature | 14/12/1956 | |
| NETHERLANDS THE | Ratification | 29/06/1957 | |
| NICARAGUA | Signature | 14/12/1956 | |
| NICARAGUA | Ratification | 18/09/1958 | |
| Nigeria | Extension | | 15/05/1957 |
| PANAMA | Accession | 01/03/1957 | |
| PERU | Accession | 04/11/1958 | |
| PHILIPPINES | Accession | 07/06/1957 | |
| POLAND | Signature | 13/12/1956 | |
| POLAND | Ratification | 14/08/1957 | |
| PORTUGAL | Signature | 14/12/1956 | |
| PORTUGAL | Ratification | 01/07/1957 | |
| Sarawak | Extension | | 15/05/1957 |
| Seychelles | Extension | | 15/05/1957 |
| Sierra Leone | Extension | | 15/05/1957 |
| Somaliland Protectorate | Extension | | 15/05/1957 |
| SOUTH AFRICA | Signature | 12/12/1956 | |
| SOUTH AFRICA | Ratification | 10/04/1957 | |
| SOUTH AFRICA | Declaration | 10/04/1957 | |
| SOVIET UNION | Declaration | 15/12/1956 | |
| SOVIET UNION | Ratification | 18/07/1957 | |
| SOVIET UNION | Signature | 15/12/1957 | |
| St Christopher, Nevis and Anguilla | Extension | | 15/05/1957 |
| St Helena | Extension | | 15/05/1957 |
| St Lucia | Extension | | 15/05/1957 |
| St Vincent | Extension | | 15/05/1957 |
| Tanganyika | Extension | | 15/05/1957 |
| The Gambia | Extension | | 15/05/1957 |
| Trinidad And Tobago | Extension | | 15/05/1957 |
| Turks And Caicos Islands | Extension | | 15/05/1957 |
| Uganda | Extension | | 15/05/1957 |
| UNITED KINGDOM | Declaration | 13/12/1956 | |
| UNITED KINGDOM | Signature | 13/12/1956 | |
| UNITED KINGDOM | Ratification | 15/05/1957 | |
| UNITED STATES OF AMERICA | Accession | 25/09/1957 | |
| UNITED STATES OF AMERICA | Declaration | 25/09/1957 | |
| Western Pacific High Commsn Territories | Extension | | 15/05/1957 |
| Zanzibar | Extension | | 15/05/1957 |