Are you sure there was no other color added? If so, a black light should help detect it.
In my experience SGC will correctly downgrade a card for such corner staining as displayed on your card, but not to the point of calling it authentic. Granted, my focus is on pre-war, but here is a card from 1916 that shows obvious coloring that could not possibly be intended to deceive:
My example is actually pretty nice compared to about a dozen others from the Green-Joyce set that have sold over the years with much more prominent teal coloring in the corners-- all of which got numeric grades, like this:
__________________
Now watch what you say, or they'll be calling you a radical, a liberal, oh, fanatical, criminal
Won't you sign up your name? We'd like to feel you're acceptable, respectable, presentable, a vegetable
If we are to have another contest in the near future of our national existence, I predict that the dividing line will not be Mason and Dixon's but between patriotism and intelligence on the one side, and superstition, ambition and ignorance on the other.- Ulysses S. Grant, 18th US President.
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