Keywords: 1941 airmail stamp C28.jpg en August 10 1941 <br /> 15¢ Brown<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 /> C28 <br /> <br /> 78 434 800 usps scan 1941 Airmail stamps of the United States Brown stamps PD-USGov |