I still am convinced that this etch is not period. Just look at the bird. There's no way the germans would design such an ugly "gonzo-style" bird. Like I said, it's a known fake pattern, seen on many (sometimes original) daggers. Here are a just a few examples of the same fake etch.
I'm also not convinced that the maker mark is not etched together with the bird-etch. This would explain why it's that high up the blade. I have had one of these fake etched pieces in hand and I can tell you, the quality is outstanding.

bl2.jpg (52.2 KB, 156 downloads)
blade1.jpg (18.58 KB, 156 downloads)
DSCN1959.jpg (115.05 KB, 155 downloads)
etch2.jpg (55.16 KB, 156 downloads)
luft%20dagger.jpg (64.32 KB, 156 downloads)