Stamps of Oman, 5 base month
1 to 31 of 31
postage
1975, May 8 Fight against Illiteracy issue unwmk p. 13.25x14.25
| - | 25b | multi | — | — |
1983, May 17 World Communications Year issue p. 13.5x14
| - | 50b | multi | — | — |
1990, May 5 Sultan Qaboos Rose issue p. 11.5x11.75
| - | 200b | multi | — | — |
2002, May 25 Sultan Qaboos Grand Mosque (5 stamps)
| - | 50b | multi | p. 13.2 | — | — | |
| - | 50b | multi | — | — | ||
| - | 50b | multi | — | — | ||
| - | 50b | multi | — | — | ||
| - | 100b | multi | — | — |
2003, May 25 Oman-China relations 25th issue
| - | 70b | multi | — | — |
2004, May 21 FIFA 100th issue
| - | 250b | multi | — | — |
2005, May 14 Civil Protection issue
| - | 50b | multi | — | — | ||
| - | 100b | multi | — | — |
2006, May 25 25th Anniversary of the Gulf Cooperation Council issue
| - | 100b | multi | p. 14 | — | — | |
| - | 500b | multi | — | — |
2012, May 7 40th Anniversary of Diplomatic Relations with Japan issue p. 13.5
| - | 100b | multi | — | — |
2013, May 25 35 Years of Diplomatic Relations between Oman and China issue p. 13
| - | 200b | multi | — | — |
2021, May 22 Lizards of Oman issue (no wmk info) (no perf info)
| - | 250b | multi | Pseudotrapelus dhofarensis | — | — | |
| - | 250b | multi | Pristurus carteri | — | — | |
| - | 250b | multi | Chamaeleo arabicus | — | — | |
| - | 250b | multi | Uromastyx thomasi | — | — |
2021, May 29 Tribute to Nurses and Midwives issue
| - | 200b | multi | — | — | ||
| - | 300b | multi | — | — | ||
| - | 1r | multi | — | — |
2022, May 12 85th Anniversary of the Petroleum Development Oman issue
| - | 50b | multi | — | — | ||
| - | 150b | multi | — | — | ||
| - | 200b | multi | — | — | ||
| - | 250b | multi | — | — |
2023, May 30 Astronomical Views over Oman issue
| - | 300b | multi | — | — | ||
| - | 300b | multi | — | — | ||
| - | 300b | multi | — | — | ||
| - | 300b | multi | — | — |
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