[Exhibitman]

I just acquired a collection with these:






They are a little taller and a little narrower than a standard baseball card. The backs are printed in red and look like this:



My trusty old Standard Catalog reports that the red backed TCMA sets were with blue and white fronts and were strip cards, and the black fronts are blank backs. These don't seem to match any criteria: they are black and white fronts with red backs and look machine cut.