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PCJust took a ruler to the enlarged scans above.
Mack measures exactly the same across both the top and bottom, and, moreover, both the left and right borders disappear, at opposite ends (although the disappearing left border is actually from the adjacent card). That is a diamond cut card. You only get a shorter measurement across the top if you meaure from the rounded top left corner. Measure across the black borders, slightly off the edges, and the top and bottom are the same.
The DiMaggio is not a diamond cut card, therefore, no inferences can be drawn from the Mack.