Stamps of Colombia, 4200 ndenom
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1952, Oct 30 1st Latin-American Congress of Iron Specialists issue ovpted (no wmk info) (no perf info)
| - | 70c | on 80c (9) |
1969, Oct 29 13th Latin-American Neurological Congress issue unwmk p. 13.75x14
| - | 70c | multi |
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