Stamps of South Africa, 18th of any month of any year
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postage
1975, Jun 18 100th Anniversary of the Death of Thomas Baines issue wmk. RSA in triangle (no perf info) (8 stamps)
| - | 5c | multi | .20 | .20 | ||
| - | 5c | multi | — | — | ||
| - | 9c | multi | .20 | |||
| - | 9c | multi | — | — | ||
| - | 15c | multi | ||||
| - | 15c | multi | — | — | ||
| - | 30c | multi | ||||
| - | 30c | multi | — | — |
1976, Feb 18 World Bowls Championships issue
| - | 15c | grnol & blk |
1977, May 18 100th Anniversary of Transvaal Supreme Court issue
| - | 4c | redbrn | .20 | .20 |
1979, Dec 18 50th Anniversary of F.A.K. issue
| - | 4c | multi | .20 | .20 |
1995, Jan 18 Tourism 1995 issue unwmk
| - | 50c | multi | .20 | |||
| - | 50c | multi | — | — |
1996, May 18 CHINA '96 issue
| - | 60c | multi |
1998, Jan 16 Endangered Fauna 1998 issue (5 stamps)
1998, Aug 18 Endangered Fauna 1998 b issue (5 stamps)
| - | 1.10r standard | multi | Taurotragus oryx | |||
| - | 1.10r standard | multi | kudu | |||
| - | 1.10r standard | multi | impala | |||
| - | 1.10r standard | multi | Connochaetes taurinus | |||
| - | 1.10r standard | multi | Kobus ellipsiprymnus |
2006, Jun 18 Red Cross War Memorial Children's Hospital 50th issue
| - | Standard Postage | multi | nurse & child | |||
| - | International Letter | multi |
2010, Jan 18 Bridging the Digital Divide issue (5 stamps)
2012, May 18 commercial & medicinal plants (10 stamps)
| - | Standard Postage | multi | Freesias | — | — | |
| - | Standard Postage | multi | Rooibos | — | — | |
| - | Standard Postage | multi | Baberton Daisy | — | — | |
| - | Standard Postage | multi | Honeybush tea | — | — | |
| - | Standard Postage | multi | Cape Aloe | — | — | |
| - | Standard Postage | multi | gladiolus | — | — | |
| - | Standard Postage | multi | African potato | — | — | |
| - | Standard Postage | multi | King Protea | — | — | |
| - | Standard Postage | multi | Marula | — | — | |
| - | Standard Postage | multi | Buchu | — | — |
2017, May 18 Bee-eaters issue (5 stamps)
| - | B4 | multi | European bee-eater (Merops apiaster) (2017) | — | — | |
| - | B4 | multi | Merops pusillus | — | — | |
| - | B4 | multi | Merops nubicoides | — | — | |
| - | B4 | multi | Merops hirundineus | — | — | |
| - | B4 | multi | Merops bullockoides | — | — |
2018, Jul 18 100th Anniversary of the Birth of Nelson Mandela issue
| - | Standard | multi | — | — |
2018, Jul 18 - Joint Issue with Germany issue
| - | Standard | multi | — | — |
2019, Jul 18 Cycads issue
| - | Standard | multi | Encephalartos laevifolius | — | — | |
| - | Standard | multi | Encephalartos laevifolius | — | — |
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