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Message:: [QUOTE="Dima, post: 25287263, member: 18037"]In my personal experience, it's rare but does happen.  Of all the coins I've submitted for regrading, I've had ~5 come back with a +.  These are usually coins from earlier generation holders which goes to show the fluid nature of TPG grading.  In theory a coin graded MS63 in 1989 would still be graded MS63 in 2024; however, this isn't the case.  I have to imagine this inconsistency is one of the major gripes some folks have with TPGs.  My biggest jump was from MS62 up to MS63+, but to be fair, this included some "restoration."  (Read: they "professionally" and properly cleaned by coin for me; likely just an acetone bath)[/QUOTE]