Unclear why you wouldn't show the card backs - as the E121/W575-1's are not hard as a general issue, just difficult with the Herpolsheimer's advertising reverse.
The known cards were all found at the same time, and up until that point, only a single example of each card was identified. There is some controversy/debate on the erasure of the back writing on some of the cards - I'm sure you can find more here on Net54 on that topic.
Putting a price tag on a unique or near-unique card is quite difficult. I'd say get the cards authenticated and graded -
The Ruth that sold in 2004 went for just under $8k IIRC
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