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fkwKen got it.
They are sometimes called W575-1B.
These cards are more closely related to the W501 set than the W575-1A set. They share the same grainy photos, caption variations, and checklist as the W501's.
They are technically not cataloged yet. They are basically a W501 without the "G-4-22" at top. Grading companies call them W575-1.
They were obviously in a vertical strip, and most of them have rough borders at top and bottom. I think they came out of a machine and were torn off one at a time (sort of like scotch tape)
Here is a post (with photos) on these from 3 weeks ago. Rhett and I talked about these exact cards.
W575-1, W501, W575-1B