GAI to PSA
A few years ago I cracked several early GAI graded cards and sent them to PSA. The grades from PSA were comparable to the GAI grades with all grading within .5 +/- the original grade. Not sure, however, if that ratio would still apply, today. GAI slabs are not had to crack, but if you have never done it before, I could understand your hesitancy to attempt it on such a high value card. As others have said, if you are wanting to sell, contact a major auction house and get their opinion.
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