PSA has a Stain qualifier, so an otherwise Gem Mint card would get a PSA 9(ST) which would equate to around a PSA 7 price. The eye appeal or the likelihood of a buyer to remove the stains/wax would also affect the sale price.
Listing a raw card as EX is probably a reasonable way to sell most of them.
That's presuming the gum stain does not actually damage the surface of the card (it could have caused bubbling, paper loss, etc).
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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