Canal Zone, Airmail, 1929, 20¢ on 2¢ carmine, horizontal pair, tied by "Cristobal, C.Z., Apr 27, 1931" duplex postmark on legal size corner card cover to Chicago, Ill., mixed franking with Columbia 1917, 1c green, two singles + 1930, 4c dark blue & black, two singles + Airmail 1929, 5c pair + 10c + 30c, all tied by "Servico Postal Aereo Scadta, 26. IV. 1931" cds's; few cover edge tears and file fold, otherwise Very Fine. Scott No. C5  Estimate $100 - 150. $0 (Image)