Good stuff!
I ran the 67 highs through the PSA pop database and got an interesting result. At one point it seemed like the series had a 5x row, a 4x row with the other five being 3x but I'm about 90% certain it's just the same 4x3,3x4 array as the semi's, although the Pinson row does seem a bit high in overall pops vs the others.
I'm working on a blog post about it but thought I'd mention it here. I'm thinking eBay pops are not robust enough to use for most series in the standard card size era.
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