COLOMBIA, 1919, 2c Knox Martin Air Post (C1).
Position 9, well-centered, tied by two strikes of Barranquilla Jun. 18, 1919 circular datestamps on cover to Puerto Colombia, arrival datestamp also ties stamp, cover barely reduced at left, Extremely Fine, an attractive use from this scarce position, especially so with a choice example of No. C1, signed Bloch and Rendon
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