Stamps of Colombia, Colombian Military Academy 50th issue
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postage
1957, Jul 20 Colombian Military Academy 50th issue unwmk
| - | 5c | p. 13 | — | — | ||
| - | 5c | blgray | — | — | ||
| - | 10c | p. 13 | — | — | ||
| - | 10c | — | — |
airmail
1957, Jul 20 Colombian Military Academy 50th issue p. 13
| - | 15c | red | ||||
| - | 20c | brn |
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