Seymour..
SGC said that heat and pressure are part of the holdering process.. not a problem for the majority of cards... but very rarely... for cards that have layers of paper loss...as such with the corner on my cobb lenox.. if the paper loss is severe enough, causing the paper to be much thinner then normal.. the card could be damaged while being holdered....So SGC will have reservations about holdering such a card....especially if it is an expensive card..
The plastic helps to protect the card from the holdering process (heat and pressure) as they described it to me... They strongly recommended it based on the condition of the Cobb...and I went with their recommendation.. as the card didn't get damaged during the process I am happy I followed their advice.
SGC has a great bunch of guys working there. Really top of the line..my advice is just let them be the judge and follow what advice they give... when it comes to should a card be holdered or not due to how flimsy the card may be.
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Jamie
Looking for T206 Errors, Ghosts and Severe Miscuts
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