Northfield, Minnesota: 1961.
Printed material sample. Approximately 6 x 6 inches. Staple mounted to card. Item #317494
"This sample is 'MYLAR' with vacuum deposited molecular film of aluminum, identical to the material used in the famous ECHO 1 SATELLOON." The sample is mounted to an Interpex International Stamp Show card, postmarked New York March 17, 1961. NASA launched Echo I, the first passive communication satellite, in 1960.