Stamps of Singapore, May of any year
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postage
2013, May 28 Marina Bay Skyline issue unwmk (no perf info)
| - | $5 | multi |
2014, May 28 Street Scenes issue
| - | 1.10$ | multi | — | — | ||
| - | 2$ | multi | — | — | ||
| - | 5$ | multi | — | — | ||
| - | 10$ | multi | — | — |
2015, May 18 Street Art issue
| - | 1st Local | multi | Street art in Paris | — | — | |
| - | $2 | multi | Street art in Singapore | — | — |
2016, May 8 Olympics 2016 issue
| - | 1st Local | multi | swimming | — | — | |
| - | 70c | multi | Shooting | — | — | |
| - | 90c | multi | Table tennis | — | — | |
| - | $1.30 | multi | rowing | — | — |
2016, May 25 Singapore's Myths And Legends issue (8 stamps)
2018, May 16
| - | $1.30 | multi | 50th Anniversary of Institute of Southeast Asian Studies |
2018, May 16
| - | $1.30 | multi | 50th Anniversary of Jurong Town Corporation |
2018, May 16
| - | $1.30 | multi | 50th Anniversary of Islamic Religious Council of Singapore |
2019, May 8 50th Anniversary of Diplomatic Relations with Israel - Joint Issue with Israel issue
| - | $1.30 | multi | ||||
| - | $1.30 | multi |
2019, May 16 50th Anniversary of Diplomatic Relations with Philippines - Joint Issue with Philippines issue
| - | $1.30 | multi | ||||
| - | $1.30 | multi |
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