Stamps of Tonga - Niuafo'ou, 21 base day
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postage
1994, Jun 21 sailing ships (1994 Niuafo'ou) unwmk (no perf info) (5 stamps)
| - | 80s | multi | — | — | ||
| - | 80s | multi | — | — | ||
| - | 80s | multi | — | — | ||
| - | 80s | multi | — | — | ||
| - | 80s | multi | — | — |
1994, Sep 21 Volcano Eruption and Evacuation of Niuafo'ou Island, 1946-1958 issue (5 stamps)
| - | 80s | multi | Vini australis | — | — | |
| - | 80s | multi | Anas poecilorhyncha | — | — | |
| - | 80s | multi | Megapodius pritchardii | — | — | |
| - | 80s | multi | Phaethon lepturus | — | — | |
| - | 80s | multi | Casmerodius albus | — | — |
1996, Aug 21 Tin Can Mail Pioneers issue
| - | 45s | multi | Charles Stuart Ramsay | — | — | |
| - | 60s | multi | Charles Stuart Ramsay | — | — | |
| - | t$1 | multi | Walter George Quensell | — | — | |
| - | t$3 | multi | Walter George Quensell | — | — |
2001, Nov 21 Barn Owls in the Moonlight issue
| - | 10s | multi | Tyto alba | — | — | |
| - | 55s | multi | Tyto alba | — | — | |
| - | $2.50 | multi | Tyto alba | — | — | |
| - | $2.70 | multi | Tyto alba | — | — |
2004, Sep 21 fruit trees (2004)
| - | 45s | multi | Paw Paw | — | — | |
| - | 60s | multi | banana | — | — | |
| - | 80 | multi | coconut | — | — | |
| - | $1.80 | multi | lime | — | — |
2012, Nov 21 Christmas 2012 issue (12 stamps)
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — | ||
| - | $1.00 | multi | — | — |
2013, Aug 21 Tin can mail issue
| - | $2.25 | multi | — | — | ||
| - | $5.40 | multi | — | — |
2017, Jun 21 100th birthday of John F. Kennedy issue
2019, Jun 21 Sharks 2019 issue (7 stamps)
| - | $2.80 | multi | mako shark | — | — | |
| - | $2.80 | multi | whale shark | — | — | |
| - | $2.80 | multi | hammerhead shark | — | — | |
| - | $2.80 | multi | Stegostoma fasciatum | — | — | |
| - | $2.80 | multi | Carcharhinus melanopterus | — | — | |
| - | $2.80 | multi | Alopias | — | — | |
| - | $9.30 | multi | Carcharodon carcharias | — | — |
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