Great dagger and it looks like a tapered tang as well. Its the first one I have seen and probably the last for quite some time, very nice that the Wingen fittings are matched with the "W" Wingen manufactured blade. I am curious as to when Hack would have added their maker mark and who did the plating, I find it unlikely that it would have been done by Wingen.
Correct me if I am wrong somebody but I was always under the impression the plating was added over the already maker stamped blade which would suggest Hack purchased the blade blanks from Wingen along with the fittings and maker marked and plated to suit?.
A very interesting dagger with a maker mark to die for.........well done and congratulations!.