Stamps of Colombia, 31th of any month of any year
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postage
1979, Oct 31 120th Anniversary of the Birth of Rafael Uribe Uribe issue unwmk p. 12
| - | 8p | multi | Rafael Uribe Uribe |
1987, Jul 31 1987 issue p. 14
| - | 25p | yel & red | ||||
| - | 30p | yel & red |
2001, Jan 31 Botero Foundation, Bogota issue p. 12.25 (12 stamps)
2003, Oct 31 50th Anniversary of DAS issue
| - | 4100p | multi |
2003, Oct 31 General Ramon Arturo Rincon Quinones issue
| - | 1000p | multi |
2008, Jul 31 Agreement Colombia-Switzerland on Trade and Friendship 100th issue (no perf info)
| - | 5200p | multi |
2009, Mar 31 50th Anniversary of Inter-American Bank of Development - BID issue
| - | 3700p | multi |
2011, Aug 31 International Year of Forests issue p. 14
| - | 6200p | multi |
2013, Oct 31 DIJIN - Fight against crime issue (no perf info)
| - | 2000p | multi | — | — |
2017, Aug 31 150th Anniversary of the National University of Colombia issue p. 13.5 (12 stamps)
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — | ||
| - | 2000p | multi | — | — |
2018, Aug 31 74th Anniversary of the Military Communications Unit issue (no perf info)
| - | 20000p | multi | — | — |
airmail
1921, Dec 19 1921 air c issue
| - | 60c | brickred | seaplane over Magdalena River | — | — |
1965, Oct 31 5th Philatelic Exhibition, Bogota issue p. 13.5x14
| - | 20c | multi | Cattleya trianae |
1986, Jan 31 100th Anniversary of the Birth of Alfonso Lopez Pumarejo issue p. 12.75x13
| - | 24p | multi | Alfonso Lopez Pumarejo |
1986, Jan 31 "Coffee and Cycling, Pride of Colombia" issue
| - | 60p | multi |
1991, May 31 Whale issue p. 14
| - | 80p | multi | Megaptera novaeangliae | |||
| - | 170p | multi | Megaptera novaeangliae | |||
| - | 190p | multi | Inia geoffrensis and sotalia fluviatilis |
1993, Jul 31 World Cup 1994 in 1993 issue p. 12
| - | 220p | multi |
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