Worldwide Stamps and Postal History

1919 First Experimental Air Mail Flight, Barranquilla to Puerto Colombia to Barranquilla by American aviator William Knox Martin, June 18, 1919. On this occasion, 200 copies of 2centavo stamps were overprinted at Barranquilla Printing Office. This was executed in horizontal strips of ten, which were severed with a guillotine knife, causing horizontal perforations to have a "cut" appearance. Of the total stamps issued, 160 were used on covers on the special flight. An unused single, perfectly centered with intact perforations, l.h., v.f., with 2014 Sismondo certificate (which identifies this as type IV in the setting of ten) (YT PA1) -
Cat. Val. €5,000