Definitely not a 6 or 7 so I don't think it's worth grading. A lot of people avoid those screw down holders like the plague. It seems they're the preferred storage method for fake cards and can also cause compression damage to cards if the screws are over tourqued. I'd definitely remove it from the screw holder and inspect before purchasing it.
If trying to flip it is your goal, I don't see much opportunity to sell it for much more than $75. If you're just wanting a '55 Aaron to add to your collection it's a reasonable price to pay assuming it's authentic.
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