The listing, USA #C86 1973 Progress in Electronics stamp, mint has ended.
USA Airmail stamp celebrating Progress in Electronics
Year: 1973
Catalog # C86
Condition: full gum, mint never hinged, post office fresh
I have several of these stamps, all identical, the scan is representative of what you will receive.
My general terms for stamp-related Listia lots can be found here (please read, it answers a lot of basic questions):
http://listiarules.webs.com/