Lot no. 971

10 c. multicoloured imperforate vignette "Pilot in plane watching Biplane" tied by "CCNA / Barranquilla" oval cachet to reverse of First Flight cover with additional franking 1c. green and 2c. red to Baranquilla, vignette with slight corner crease at upper left, cover slightly shortend and openend out for display, a very rare cover with only 9 known, signed Kessler, certificate RPSL (1996)