I'm a player collector (Lou Brock) and I'd buy a wrong back Brock for my collection. How much of a premium, I don't know, but probably not much more
than the regular card in the set in the same condition went for, as it is not really a variation, just a printing error.
But some obsessed Mantle collector might pay bunches for it.
The fact that there is apparently one on Ebay that didn't sell for $495 tells you it's not worth that much.
I'd guess 1.5 to 2x the value.
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