Stamps of Oman, 28 base day
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postage
1979, Oct 28 International Year of the Child issue wmk. crown & CA spiral p. 14.25
| - | 40b | multi | child on a swing | — | — |
1982, Oct 28 Municipalities Week issue unwmk p. 13.5x14.5
| X | 40b | multi | — | — |
1994, Dec 28 250th Anniversary of Al-Busaid Dynasty issue (15 stamps)
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | p. 11.75 | — | — | |
| - | 50b | multi | — | — |
2021, Jan 28 10th Anniversary of the Dar al-Hanan Children's Cancer Home issue (no wmk info)
| - | 1r | multi | — | — |
2021, Oct 28 ICC Men's T20 World Cup - Oman issue
| - | 1r | multi | — | — |
2022, Mar 28 10th Anniversary of the Royal Opera House, Muscat issue
| - | 200b | multi | — | — | ||
| - | 300b | multi | — | — |
2023, Dec 28 Oman-Saudi Arabia Direct Highway Opening issue
| - | 300b | multi | — | — | ||
| - | 500b | multi | — | — |
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