COLOMBIA, 1920, 30c Black on Rose - Sept. 8, 1921 Puerto Berrio-Medellin Experimental Flight (C14). Irregular block of eleven consisting of the bottom three of the fourth column and entire fifth column of pane, each stamp cancelled by violet "Manuel Jose Tobon" handstamp and tied by stray ink on reverse of large cover, used with nine National 3c stamps tied by Puerto Berrio circular datestamps, cover addressed to Barranquilla, vertical file fold affecting one National and one 30c stamp, top stamp with minor faults due to placement and bending of cover at top, all of which is to be expected on a cover of this size

FINE AND IMPRESSIVE MULTIPLE OF THE 30-CENTAVOS USED ON THE SEPT. 8 EXPERIMENTAL FLIGHT. THIS IS THE LARGEST RECORDED MULTIPLE OF THIS STAMP ON COVER.

Paying the 11x letter rate (up to 175 grams).

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