Len
Well, Its an interesting knife for sure, after looking through my Klaas catalogue I believe the piece to be original to the period, the blade style and shape is typical for Klaas, they used it on there private purchase bayonets, the fact that the tang is viable leads me to believe that it was specially ordered from Klaas that way, the embellishment on the crosspiece i believe was not done at the factory but by the original owner.
It is of course similar to the Chromolit-Arthur Wingen (CHAW) Waffen Loesche knives, I'm not convinced that it was made as a rival otherwise I think we would see many more, it was more than likely ordered by an individual to his specification and for an unknown use.
Whatever it looks good next to the Waffen Loesche knife and a great addition to your collection.
Cheers
Gary
