I’m not sure if this is the right place to post this or not, but I have several first day of issue envelopes and commemorative coins for the Pioneer 10 & 11 missions created by or for TRW Systems Group.
If someone with more knowledge could tell me a little more about these specific items, I’d love to have some more information on them. I bought about 20 at an estate sale because I’ve always been fascinated with space and I think I got them at a good price. They seem to be part of a limited production promotion (possibly for TRW employees?).
Thanks for any help!