Can u name and give some history on this weapon?

Hello, a while back i bought a sweet looking trench spike from an antique shop, I have done several google image searches but haven't found a match for it yet, the closesti can get to it is a U.S. Model 1918 trench knife, but instead of "U.S. 1918..." on the grip there is just an arrow pointing to the knuckle guard and instead of a knife it has a 6" long spike (like a really large nail), the base of the grip also doesn't have that hexagonal mini spike but is flat. Thanks! = )