This memorabilia from the Supermen of America Organisation was sent from the Action Comics Headquarters in New York City to a young boy aged 12 back in the 1940-50's. The copyright quotes at 1948 but it's hard to find out the full story of when this was made and sent with it being so long ago.
The fan club was established way back in 1939 so fans could send away for a full kit which included Superman's Secret Code Manual, welcome letter from Supermen of America Headquarters, the official membership certificate, the original Superman pinback and the original mailing envelope.
It must have been cherished by its owner because despite its age all of the pieces are in an unbelievably stunning condition with no rips or tears.
Please message the team at email@example.com if you're interested or want any more info on this very rare complete piece of Superman memorabilia.