I guess this is the appropriate thread since I did find this today. My sister gave me some old pennies today, and found this in with them. I was shocked! (sorry abut the bad quality pic, had to use web cam)
If you can get a better camera, a nice shot of that coin would be great. Not often you come across a key Lincoln, especially in circulation. I'll assume your sister found it in change at some point in the past.
They were given to her by an older guy, 70's -80's My sister was his mothers caretaker. She had past away a while back and he gave these too her. This was in a book of wheat cent dated 1909-1945. She had took them to the coin shop to sell them, he told her all the good collectible ones were not there, (maybe missing 6 out of the set) So he wasn't interested, told her they were not worth much. So she gave them to me today. Guess the guy at the coin shop missed this one. Sad though cause she sold some nice coins I would have loved to have.She started at first to give me a 1865 IH, I told her I liked cause it was CW dated. Ended up letting me have all of them.
I will try and get better pics later