They look like 7s and a 6 or two. Not sure how much value it adds for them to be in a slab. As hard as it is to find tall boys in good shape, you would think they would go for more in high grades but they don't. Nice cards.
To be honest I wouldn't waste your money grading those. I'm working on the set in 8's/9's and the 8's are easy to find and don't sell for much at all. The 9's do better but it's the 10's that command a premium as those are tough to find in gem mint condition. I would agree that what you have is mid-grade cards and aren't going to have much interest on the open market.
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lee