USA & Canada
Including Alaska, Hawaii, Puerto Rico and U.S. Virgin Islands.
| Date | Letters | Air Letters | Post Cards | 2nd Class |
| 25/05/1966 | 15c per ½ oz. | 10c | 11c | 8c per oz. or part thereof. |
| 01/07/1971 | 15c per ½ oz. | 11c | 11c | 8c per ½ oz. or part thereof. |
Central & South America
Including all islands of the West Indies, Bermuda, Falkland Islands.
| Date | Letters | Air Letters | Post Cards | 2nd Class |
| 25/05/1966 | 12c per ¼ oz. | 10c | 11c | 15c per oz. or part thereof. |
| 01/07/1971 | 18c per ½ oz. | 11c | 11c | 10c per ½ oz. or part thereof. |
Great Britain, Northern Ireland & Irish Republic
| Date | Letters | Air Letters | Post Cards | 2nd Class |
| 25/05/1966 | 12c per ¼ oz. | 10c | 11c | 15c per oz. or part thereof. |
| 01/07/1971 | 18c per ½ oz. | 11c | 11c | 10c per ½ oz. or part thereof. |
Europe
Including the Azores, Iceland, Soviet Union and Turkey. The Islands of Cyprus, Malta and other Islands of the Mediterranean.
| Date | Letters | Air Letters | Post Cards | 2nd Class |
| 25/05/1966 | 12c per ¼ oz. | 10c | 11c | 15c per oz. or part thereof. |
| 01/07/1971 | 18c per ½ oz. | 11c | 11c | 10c per ½ oz. or part thereof. |
Africa, Asia, Australia, New Zealand & Pacific Islands
| Date | Letters | Air Letters | Post Cards | 2nd Class |
| 25/05/1966 | 22c per ¼ oz. | 10c | 22c | 29c per oz. or part thereof. |
| 01/07/1971 | 30c per ½ oz. | 11c | 11c | 15c per ½ oz. or part thereof. |
Interinsular
| Date | Letters | Air Letters | Post Cards | 2nd Class |
| 25/05/1966 | 8c per 2 oz. | | 5c | Newspapers approved as such the postmaster.
3c per copy. |
| 01/07/1971 | 8c per 2 oz. | | 5c | Newspapers approved as such the postmaster.
3c per copy. |
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