Could be a grease-filled die, which is interesting, but not a huge extra value. Does the coin look cleaned to you? in this lighting it kind of does, but it might just be the photo.
It is definitely the lighting, it's an old brown color, typical circulated wheat look. I took the photo at this angle to get the light right on it so it was easier to see the "9".
I am not an expert at all, but I would say it has not been cleaned.
It was mixed in with about $11.00 worth of wheats that looked the same way.
I will try and get a better, more naturally lit photo tomorrow.
I have never seen a coin like this in person before so I got excited, haha
It does look like a grease filled die which is common among wheat cents. If all the wheats look the same they could have been cleaned a while ago and tarnished or they could all just be the same color but, nice score on all the wheats and i hope that it does turn out to be a struck through grease!