Those sound interesting. I haven't heard of them before, but I do have a few cards that are newer but similar.
1979 topps with 1978 Topps backs
197* Topps backs with mork and mindy sticker fronts (Don't recall the year, and the sticker fronts are printed on cardboard rather than sticker material)
Bazooka box with 1978 topps backs inside
Bazooka box with Black hole backs inside
These came either from sheets used to adjust the presses - the wrong back cards. Or as a way of using up unfinished stock in the case of the Bazooka boxes.
Steve B
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