Product Details

Lot of 15 airmail stamps 3 of which described below 1973 13¢ Winged Letter U.S. #C79 was released in anticipation of an airmail postal rate increase from 11¢ to 13¢ for each ounce of domestic airmail. U.S. #C114 1985 39¢ Lawrence and Elmer Sperry Pioneers Of Aviation Series This second of two stamps honoring aviation pioneers features Lawrence and Elmer Sperry. Elmer was awarded more than 400 patents. He revolutionized flying with such devices as the gyro compass and speed-direction indicators. Lawrence helped to develop and test such aviation innovations as the automatic pilot, retractable landing gear, and the first guided missile in the form of an aerial torpedo. Elmer died in 1930, and Lawrence drowned in 1923, after crashing on a flight over the English Channel.