According to a US dealer, this cover was produced by a prisoner who created them in a prison print shop. The same information applies to other 'prisoner' cancellations of Apollo 4 and Apollo 7 in this report.1
1) Study of Suspect Space Covers CD, 2001, Paul C. Bulver et. al.
i) From collection of David Ball via collectSPACE
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Last modified on 26 September 2020