Stamps of Colombia, 8th Pan-American Highway Congress issue
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postage
1960, May 28 8th Pan-American Highway Congress issue unwmk p. 11
| - | 10c | bl & grn | (1961) | |||
| - | 20c | multi | Pan American Highway through Colombia (1961) |
airmail
1960, May 28 8th Pan-American Highway Congress issue
| - | 10c | vio & grn | w. unwmk, p. 11 (1961) | |||
| - | 20c | red & bl | w. unwmk, p. 11 (1961) | |||
| - | 30c | blk & grn | w. unwmk, p. 11 (1961) | |||
| - | 2.50p | brn & bl | Pan-American Highway through Colombia, w. REPUBLICA DE COLOMBIA, imperf | — | — |
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