In my experience, SGC has been honest in its PSA crossovers. I've had some really nice PSA 4s cross to SGC 60s, without cracking the case -- one was a T206 Cobb.
When I submitted 40 PSA T206 cards for a cross-over awhile back, only about 30 crossed over. The 9 of the ten that didn't were because PSA had encapsulated a creased card without noticing or caring. And my PSA 5 T206 Home Run Baker didn't cross because of evidence of trimming.
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