How do you think this Billy Williams card would grade?

How do you think this 1966 Billy Williams card would grade? I need to put together 15 cards for my platinum membership but I'm not sure if I should include this one. There is a spot in the lower right corner of the card but I'm not sure what it is.
0
Comments
6 (ST)?
If that is paper loss then probably lower than a PSA 5??
Agreed. Is that some kind of discoloration/stain, or is it paper loss?
I'm not sure. I'll have to look at it closer tonite.