For a slabbed card anyhow, I would define materiality as any alteration that -- if known to the grader -- would have resulted in the card not receiving a numerical grade. Best I can do off the top of my head. I'll think about it some more.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
Last edited by Peter_Spaeth; 06-11-2019 at 01:18 PM.
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