I was wondering whether you have found any SMS (Special Mint Set) coins while roll hunting? These coins replaced proof coins for a brief time shortly after 1964.
Like early proof coins, it isn't easy if the original luster is lost to circulation. The overall strike would be some indicator, although I am sure there is some overlap with the business strikes there. There may be some unique die markers, but I am not aware of any.
I've found plenty of proof coins, but no SMS coins. I am sure that someone, somewhere has put them into circulation, however.
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