I believe the correct spelling here is Huhnlein. Wink
One agrument,at least IMO, that could be put forth in favor of this dagger is all the other political leaders Himmler,Rohm etc. had their own presentation dagger so why not the head of the NSKK?
I have a documented SA presentation dagger in my collection which was presented by an officer with the rank of Standartenfuhrer which is equivalent to a Colonel in the US Army. I'm stating this to point out that you didn't have to even be the head of a political organization to have a presentation dagger.
Now having said that I,like most,tend to defer to Frederick Stephens when it comes to blade etches in general and facsimile signatures in particular.
I along with many other await the presention of additional evidence here.

Fred:
If you're referring to that P38 with the "Himmler Inscription" I too believe it was done post war.
Jim