Interesting
I bought a rubber stamped autographed 1953 Bowman Campanella from the Gray Ghost here on Net54 recently.... and it has the same issue your 1966 Topps Mantle has! These were probably in a large stack.... stamp, stack, stamp, stack..... etc..... and you can see a bit of the prior card stamp wet transfered onto the back! Not a big deal but shows they were in a "production line"..... cool cards just as they are IMO.
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