Agree with Bill, who is an expert (hi Bill).
The best way to tell is a side by side comparison. I know of no way to tell the difference on any of them by looking at the fronts.
Unfortunately, a side by side comparison is not possible on eBay. And it's become a real problem with people listing gray backs on eBay that aren't gray backs and nobody at eBay cares. Even PSA struggles with them and I've seen dozens of mislabeled PSA cards. I've reached out to PSA with my concern and it falls on deaf ears. I've been keeping a database on '54 gray back Jackie Robinson's that are PSA labeled. I estimate about HALF of the PSA labeled Jackie Robinson 1954 gray backs are mislabeled and are in fact the standard cream back. Crazy.
Individual scans don't always show it the best either. If a seller lists a '54 gray back, I always look at that sellers other items for sale and compare the backs of other '54s they may have listed.
Good luck out there, it's the wild west with '54 gray back identification.
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