On the reverse of this coin has extra lettering some. Looks like maybe the coin was rotated some during the process.
It looks like a little damage to the lettering, and the usual circulation wear. It might also be a touch of a Woodie as I see some evidence of grain in the surface.
I think your coin could be a Lamination Error. It is old enough that contamination has started to lift the laminated metal up. Full photo of coins reverse shows it the best.
Thanks for the last two photos. If you look at the T in CENT you can see where it took a hit. The reverse is damaged from that T into and last the ED in UNITED.
If it was you would also see evidence of another image on the obverse also.. It's not a double struck issue. All I see is circulation wear.
I think what you mentioned as being extra letters on the reverse of your coin is actually the serrated like edge of a Lamination Error across full coin edge to edge from 2 o'clock to 8 o'clock. I also think there is PMD to the T of cent and ED of united as Collecting Nut stated. Some of what looks like damage is the lamination starting to peel up away from the surface of the coin.This coin has a visibly noticeable different texture on ether side of the lamination line. From the amount of wear it shows I would say your coin has been out of circulation longer than it was in circulation.
Heres a little better picture of it. It no wood grain and it does look like its been rotated some during the process. Im gonna get this one graded. I dont mean to sound like an a.. The picture isnt that good. I can see it good even in this pics.
It is just a Lamination error. Common on older wheat cents. No need to send it in for anything. It's not worth it. And.. You can send in any coin for grading. Grading has to do with the condition state it is in. You would send an error or variety for attribution which is a separate proccess by the graders. Separate fees apply so it's a bit more expensive. Not worth it.
