COLOMBIA, 1920, 30c Black on Rose - Apr. 28, 1921 Bogota-Girardot Experimental Flight (C14). Cancelled by violet Bogota cancel, used with National 2c and 3c tied by indistinct machine cancel on censored cover to New York, 30c with minor faults, otherwise Fine and interesting cover, we are unsure why this cover was censored at this late date despite strained US-Colombia relations at the time

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