It looks like a coin. But it is worn to the point where it is impossible to identify year. Time is not kind to pure copper coins.
Lettering would be
--
ДЕ
НГА
year
--
Only two year digits visible. 11 would point at Peter, but he used letters instead of ornament on edge. 1811 would be Alexander, but his designs are different.
Denga is Russian denomination for ½ kopek.
I think numista combined all those ornamented dengas under N#11217
From numismatic perspective I don't see the reason to counterfeit it.