COLOMBIA, 1921, "Valor 30 Centavos" on 50c Pale Green, Air Post Surcharge (Colomphil 20; Scott C20).
Sheet margin at left, tied by Girardot oval cancel and used with National 3c (uncancelled) on cover to Philadelphia Pa.,
cover with small tear at top left and slight overall toning, otherwise Fine and exceptionally rare, likely only two or three
are addressed to a destination outside of Colombia
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