Not sure so don't take this as gospel, but from what I've seen, I THINK the following generally applies:
1) For PSA/DNA, and JSA/BGS, if slabbed, only the sig is authenticated and nothing is mentioned on the flips about inscription.
2) if full LOA, from JSA, the letter usually mentions if the inscription is in the hand of the signer or not. For PSA/DNA, I don't think it is mentioned either way.
Your mileage may vary, and the companies might change the way they do it from time to time as well.
Mike
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