3 at best but.....
It really makes NO difference unless you are buying or selling - so as to help set a price......... On any given day one can expect to see at least a half grade (or more) difference FROM ONE DAY TO THE NEXT on the same card. Unfortunately - NOT a science. Buy what you like and do it the way you want. In general I don't think it prudent to grade a card that isn't rare or in exceptional condition for the issue. Defect or wrinkle = likely the same result. That said - I DO have a few 19th century sets graded - and not all the cards are mint or rare. In fact, few are :-)
no guarantees whether written or implied.
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