I hope some of this stuff means something to you, Steve, I don't know squat about printing really.
For the sake of completeness, here are my T25 strips I got recently, clearly not printed in block format. These two strips do not fit together, and have a right side border. Presumably there were more cards to the left in each row.
This is all I know of of uncut ATC/presumed American Lithographic cardboard cards. The T62 internal test sheet, these T25's, the T220 Silver's, These E229 or D353 sheets, and then of course the famed Wagner strip. There is probably more known to others, this is just all I have records of in my photo archive or possession.
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