Looks like I messed up psting this last night
In 1979 Topps offered Tradin Cards as a premium. I think the offer was part of the jumbo cello packs, but I'm not sure at the moment.
These were cards offered by a private company and were mostly made to give parents some fun cards of little leaguers. But occasionally an enterprising individual would use other pictures. I think they were supposed to be screened for this, but some did slip through.
A neat twist on a non-Topps Topps premium.
Steve B