A little while after writing the previous post it dawned on me what is probably the solution to the dilemma on how the 1957 Topps Football Slits were printed. Yes, there are three 9 card panels showing the Ed Brown row directly above the Carl Tasseff row, but they are all blank backed and I now believe these are pre-production proof panels cut from a full pre-production proof sheet and were never actually printed and issued in packs. There are no known miscuts of E Brown row cards above Tasseff row cards that I am aware of. This would result in the most plausible explanation that there was only one 264 card super sheet with two Slits that went:
Tasseff
T Rote
Stonesifer
Retzlaff
Watkins
McCormack
Tarasovic
E Brown
Bingham SP
Nickel SP
Carpenter
Bratkowski
and
Hornung SP
McElheeny SP
Tasseff
T Rote
Stonesifer
Retzlaff
Watkins
McCormack
Tarasovic
E Brown
Carpenter
Bratkowski
This would explain why the ten DP rows have very similar quantities and the four SP rows have very similar quantities.
https://www.worthpoint.com/worthoped...cut-2147615596