You mean a t45...
Yes, there were black bayos. Commonly thought to be result of refurb.
I think he means it is a 1956 Russian.
Correct me if I am wrong, but are there not two types of black bayonet, one that has a deep shiny bluing...more like a black chrome...and others that appear to be painted black. The painted black ones would seem likely to be refurbished, nicked up blasted grey bayonets...but the 'black chrome' ones appear to have been like that in the first place. Most I have seen appear to be the painted type, few and far between the shiny ones show up....but much less frequently. Many of the painted ones have nicks where the blade meets the stock ferrule....something that doesn't seem possible with the black chromed ones.