Keywords: 1941 airmail stamp C29.jpg en Auguat 27 1941 <br /> 20¢ Green<ref group P name rotary /><ref group PERF name perf 11 x 10 5 /><br /> 200 Subject Electric Eye Plates <br /> The Twin-Motored Transport Plane <br /> C29 <br /> <br /> 42 359 850 own scan usps 1941 Airmail stamps of the United States Green stamps PD-USGov |