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| Year | Date | Description |
|---|---|---|
| 1856 (1864?) | [?] | Indian Postal Administration begins |
| 1944 | November 20 | Bicentenary of the Al bu-Said Dynasty |
| 1947 | December 19 | Indian Postal Administration ends |
| December 20 | Pakistani Postal Administration begins | |
| 1948 | March 31 | Pakistani Postal Administration ends |
| April 1 | British Postal Administration begins Definitive Issue |
|
| April 26 | Royal Silver Wedding | |
| July 29 | 14th Olympic Games | |
| 1949 | October 10 | 75th Anniversary of the UPU |
| 1950 | October 2 | Definitive Issue |
| 1951 | May 3 | Definitive Issue |
| 1952 | December 5 | Definitive Issue |
| 1953 | June 10 | Coronation of Queen Elizabeth II |
| August 31 | Definitive Issue | |
| November 2 | Definitive Issue | |
| 1954 | January 18 | Definitive Issue |
| 1955 | September 23 | Definitive Issue |
| 1956 | [?] | Definitive Issue |
| June 8 | Definitive Issue | |
| August 2 | Definitive Issue | |
| December 9 | Definitive Issue | |
| 1957 | February [?] | Definitive Issue |
| February 3 | Definitive Issue | |
| February 10 | Definitive Issue | |
| March 1 | Definitive Issue | |
| March 4 | Definitive Issue | |
| [?] | Decimalization of the Indian Rupee: 1 Rupee=100 Naya Paisa | |
| April 1 | Definitive Issue | |
| August 1 | World Scout Jubilee Jamboree | |
| 1959 | March [?] | Definitive Issue |
| April [?] | Definitive Issue | |
| 1960 | January 27 | Definitive Issue |
| April 26 | Definitive Issue | |
| June [?] | Definitive Issue | |
| June 21 | Definitive Issue | |
| August 30 | Definitive Issue | |
| September 28 | Definitive Issue | |
| 1961 | April 8 | Definitive Issue |
| 1963 | October 11 | Definitive Issue |
| 1966 | April 29 | British Postal Administration ends |
| April 30 | Postal independence (Muscat & Oman) New currency: 1 Rupee=64 Baizas Definitive Issue |
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| 1967 | [?] | Definitive Issue |
| 1969 | January 1 | First Oil Shipment (July 1967) |
| 1970 | May 7 | New currency: 1 Rial=1000 Baizas |
| June 27 | Definitive Issue | |
| August 9 | New country name: Sultanate of Oman | |
| 1971 | January 16 | Definitive Issue |
| July 23 | National Day | |
| November [?] | Definitive Issue | |
| December 25 | 25th Anniversary of UNICEF | |
| 1972 | January [?] | International Book Year |
| March/April | Definitive Issue | |
| June 6 | Definitive Issue | |
| July 1 | Definitive Issue |