Ouch ...
Detlef, it looks to me as though you may have a composite of several components, some of which may not be very old. The hilt and all of its stuffing (including the stray piece of iron) look to me that they did not come with the sword originally. It's hard to tell how well the blade fits the wooden sheath, which might indicate that it too is an unrelated marriage. And the blade itself looks rather thin for these knives.
These have now become very desirable and quite expensive, so much so that I imagine unscrupulous people would be quite happy to throw a few unrelated pieces together and try to pass it off as original. I hope that is not the case here, but you should be able to tell when you have it in hand.
Good luck!
Ian.