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postage

1952, Oct 30 siderurgical conference issue ovpted wmk. wavy lines (Colombia) p. 12.5

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15c on 25c

grn

Mutis & Triana

airmail

1952, Oct 30 1st Latin-American Congress of Iron Specialists issue ovpted (no wmk info) (no perf info)

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70c

on 80c (9)

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