Scott,
Here is the problem your having IMO, your using pop report numbers as the basis for your theory. The problem is your data is flawed. I went to the PSA pop reports and there are several cards with lower pops that are not rare.
Cliff Blankenship -17
Frank Corridon- 13
Frank Isbell- 13
Harry Davis- 14
Sam Leever- 16
These all have population numbers close to what you have shown, yet not of these cards are rare IMO.
Obviously you can not compare a HOF to a non HOF as we all know more HOF will get graded.
The way I see it you would have to id a specific group of cards (which it seems you have) and show that they turn up with this shaded back on a semi regular basis, otherwise it was just something in the press IMO that ran for a while and was corrected. Neat but not a huge deal.
If you have a list of cards that only came with the shaded backs then that would be something else, but if I understand what you saying it is that this group comes with and without, and that the shaded are rarer and should carry a premium and be noted on the flip.
James G
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WTB Boston Store Cards esp Ruth, Hornsby and 1915/16 UNC Strip cards and other Boston Store's too.
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