The gripper could be the part that clamps the plate in the press. So gripper with an arrow would be a note on what way to install the plate.
Or it could be related to the cutter. I'd have thought they were using a normal cutter that cut stacks of sheets in the early 60's, but I'm pretty sure they were using some sort of automatic cutter by at least 78. I have a few cards I found new back then that have odd damage across the card that I labeled "gripper tracks" For lack of a better name.
I'll have to scan one.
Steve B
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