What kind of knife is this ?

[Alan62]

Thanks for the answers.
I also do not believe it was ever a bayonet(Nice rifle Not2Sharp)
If you look close at the details of the blade it seems to be layered metal.It is hard to see because of the "acid damage" and in the pics but up close in person I can see layering.
If I dipped a regular blade or bayonette into acid would it reveal layering?

Thanks again