50 cent yardsale find !!! 1957 Topps Twin Blony/Bazooka variation question?

Found the twin bloney 3rd/4th series checklist variation I needed for my 57 set.
The question is if marked what is the best grade you can expect?
Is it best just to get it slabbed authentic?
Thanks for the expert help.
The question is if marked what is the best grade you can expect?
Is it best just to get it slabbed authentic?
Thanks for the expert help.

Craig AKA "Crazylegs"
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Bosox1976
"Molon Labe"