It seems to me that there is not one, but two issues under discussion. One issue is about the legitimate existence of the H�hnlein daggers as a group.
The other is about the H�hnlein dagger that was posted to start this thread.
1) Why does the signature area have that washed out appearance?
2) It was admitted right up front that the grip did not fit. But we are not talking about some slight amount of shrinkage which can sometimes happen. Beside the fact that it doesn't fit properly in multiple areas. There is also an offset.
3) And that does not explain in three of the images (especially the second one) why the crosssguard to mouthpiece fit is also off.
Quite frankly, from what I see in the images posted it looks more like an altered parts dagger than a period original. FP
