Large cent type

[Wheatsweep]

I found this. Same size as large cent. Not much other detail other than these ridges. Not sure if they are random or actual coin detail.

 

[Wheatsweep]

Picture

 

[jewelerguy]

If possible, post closer pics of both sides. A little more cleaning could help as well. One thing is certain - that is no intentional detail of any US large cent. It could be a counter stamp, or maybe damage from being struck with a hammer or something