Lincoln Wheat Grading Question

Not my series so I have just a few questions to the experts....
1. What is the best way to tell a BU S mint mark that is weakly struck from a slider?
2. Can sliders be just as brilliant red as BU Lincolns?
3. Would an early album(50's era) with clear slides cause BU coins to look like they have wear on one side from the slide going back and forth to add coins? The obverse of some of the set I am looking at has coins with a little more contact on the cheek and chin, but the wheat ears look pretty good(no wear). Would these grade as uncirculated or AU?
Thanks!
1. What is the best way to tell a BU S mint mark that is weakly struck from a slider?
2. Can sliders be just as brilliant red as BU Lincolns?
3. Would an early album(50's era) with clear slides cause BU coins to look like they have wear on one side from the slide going back and forth to add coins? The obverse of some of the set I am looking at has coins with a little more contact on the cheek and chin, but the wheat ears look pretty good(no wear). Would these grade as uncirculated or AU?
Thanks!
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Comments
2. no not unless its been worked.
3. depends could be either. If the reverse is truly new then the coins will sell as unc unless the fronts have slide marks that are pretty nasty. Oftentimes what you are thinking is slide wear is really where the previous owner used his fingers to push the coins in to seat them before sliding the plastic cover back.
The plastic slides shouldn't touch the coins other than maybe the rims, I could see a hairline if the edge caught the coin but it's not going to "wear" the coin.
Color shouldn't be a judge of grade, you can have a high grade BN or RB.
If you see wear on a red cent it might be cleaned or re-colored.
It was a 20-S graded 62 RD. That coins obv looked like a 64 but the rev was horrible, almost no wheat lines.
I'm guessing they dinged it a lot for that rev.
Funny thing is if it had any rub and was BN it would have probably dropped instantly from any unc grades to below XF.