I took a quick look at some recent comps and obviously small sample size but it would contradict what I just wrote. A couple of SGC 7.5 Nolan Ryans just sold on eBay, one for $676 and the other for $749. The PSA 7 price has tended to be in the $500-600 range.
A 71 Clemente SGC 7.5 just sold for $809. PSA 7s tend to be in the 600-700 range.
That all said, if you're looking to move a PSA 7 into an SGC hopeful 7.5, I wouldn't do it. Not enough upside to offset the cost and risk of the reslab.
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