The coin that shows next to my posting is a 1880 over 79. I had the coin since the 70's and never knew that it was an error coin. A few years back I bought a scanner that can do high resolution and that's when I found out. Before that, I tried using a 30x loop and couldn't see it.
If you google PCGS coin facts. You can find what a RD, RB, and BN cent looks like. The above are no longer used as soon as the coin is deemed AU or less.
Coins that are slabbed as RD can and do tone in the slab. So it's entirely possible that a coin in a current RD slab would not regrade as RD today or in the future.
I’ve got to say: the holder is far more deceptive than the coin, to me. I really hate having to authenticate plastic, but, here we are.
I just saw the description: "son needs a car my loss ur gain great price" Also see: https://www.ebay.com/itm/1955-double-die-lincoln-cent/173975399577
When I purchased a raw 1909-S VDB a number of years back I definitely researched what to look for. I matched the date/mint mark to one of the four known obverse dies and also scrutinized the VDB on the reverse.
In addition to the PCGS site given by @wxcoin, here's another https://www.ngccoin.com/news/article/5217/Counterfeit-1909-S-VDB-Lincoln-Cents/
Those are great sites, I guess my eyes need more training. From the pictures, the S looks a little off to me and I couldn't tell anything from the VDB, am I in the ballpark?
The S doesn't seem to fit any of the four obverse dies. It's closest to #3 but not close enough to the 9 in my opinion. Better photos would help. I can't see much of the VDB in the reverse photo.