Marine dagger opinions?

[KOSTEN]

Hello, I am asking for advice on this dagger as to whether or not it is authentic. Crossgraining is very good on the blade. Very beautiful etching on an edge. But I didn't find the image of such dirk with a white handle in such sheath ... (
Thank in advance!

[KOSTEN]

If it is honest, I don't understand - by edge of the cone of a handle in the form of a direct crown, but not a slanting sea wave. What you will tell?