Fantastic research Pat.
My math:
1 7/16 = 1.4375 inches
2 5/8 = 2.625 inches
17 cards x 1.4375in = 24.4375in + presumable border spacing
12 cards x 2.625in = 31.5in + presumable border spacing
We know that at least some 1910 T card sheets for the same client were ~51x~34. Interesting parallels here when we adjust for the sheet border beyond the cards.
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