Stamps of Oman, 12 base day
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postage
2000, Jun 12 marine life (2000 Oman) unwmk p. 13.5x13.75 (6 stamps)
| - | 100b | multi | Hippocampus kuda | — | — | |
| - | 100b | multi | Ostracion cubicus | — | — | |
| - | 100b | multi | Monocentris japonica | — | — | |
| - | 100b | multi | Pterois antennata | — | — | |
| - | 100b | multi | Rhinecanthus assasi | — | — | |
| - | 100b | multi | Taeniura lymma | — | — |
2002, Aug 12 marine turtles in Oman (no perf info)
| - | 100b | multi | Olive Ridley | — | — | |
| - | 100b | multi | green turtle | — | — | |
| - | 100b | multi | hawksbill | — | — | |
| - | 100b | multi | loggerhead turtle | — | — |
2012, Dec 12 Arabian Horses 2012 issue - Arabian Horses (2012) (10 stamps)
| - | 100b | multi | — | — | ||
| - | 100b | multi | — | — | ||
| - | 100b | multi | — | — | ||
| - | 100b | multi | — | — | ||
| - | 100b | multi | — | — | ||
| - | 100b | multi | — | — | ||
| - | 100b | multi | — | — | ||
| - | 100b | multi | — | — | ||
| - | 100b | multi | — | — | ||
| - | 100b | multi | — | — |
2014, Dec 12 Souq Muttrah issue p. 13
| - | 200b | multi | — | — | ||
| - | 250b | multi | — | — |
2018, Dec 12 60th Anniversary of the Shell Oman Marketing Company issue
| - | 200b | multi | — | — | ||
| - | 500b | multi | — | — | ||
| - | 600b | multi | — | — | ||
| - | 800b | multi | — | — |
2021, Oct 12 Corals of Oman issue (no wmk info) (no perf info)
| - | 100b | multi | — | — | ||
| - | 200b | multi | — | — | ||
| - | 200b | multi | — | — | ||
| - | 500b | multi | — | — |
2022, May 12 85th Anniversary of the Petroleum Development Oman issue
| - | 50b | multi | — | — | ||
| - | 150b | multi | — | — | ||
| - | 200b | multi | — | — | ||
| - | 250b | multi | — | — |
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