COLOMBIA, 1921, "Valor $.0.I0" on 50c Pale Green, Extra Period and "I" Instead of "1", Air Post Surcharge (Colomphil 5b; Scott C24Cf).
Light Girardot oval and small part of Barranquilla handstamps, fresh color, typical rough perfs, couple light bends, otherwise Fine and rare, only two examples
of this error surcharge are recorded to date
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