There is no back to this 1976 D penny. The front is completely stamped, but kind of stamped further in, but the back is blank, smooth, nothing is there... common? worth money?
Without pics, we can't tell you much. What I can tell you, though, is it was never a wheat back, it was a memorial back. The reverse was ground off AFTER leaving the mint. It's just damaged.
Interesting in that it shows a rim, so not your usual grinding wheel manufactured "error". Perhaps @Fred Weinberg might comment. Be patient opinions will come
The Obverse is fine. It looks like a Misaligned Die Strike. I think this Cent might be a Cent that broke in half. Split after strike. You can see a ghostly image of Lincoln on the Blank side. Can we see a picture of the edge?
Can we see better pictures in general? I don't necessarily agree that the coin broke in half but I would like to see some clearer pictures. EDIT: perhaps I stand corrected. Def would like to see pictures of the edge.
Someone did something to this coin. Looks smoothed and with a shadow like Lincoln (facing left, instead of right). Not from the Mint. Occurred afterwards. Welcome to CT. EDITED: It may be a split as on Paddy's coin. He is showing a shadow on his as well. I have to admit, I've never seen a split planchet.
Do you have access to a scale that weighs to the nearest gram? It looks very thin, I am definitely leaning towards @paddyman98 answer.
Split planchets after strike are rarely so smooth in the interior of the planchet, as the design elements from both sides produce uneven pressure gradients across the coin and an unevenness of the splitting surface when the two halves are parted. Paddy's LMC exhibits that, as does the Barber Dime below: The extreme flatness of the "interior" of the subject Lincoln cent, coupled with the complete lack of mint luster on the obverse leads me to believe it is a post-mint alteration.