Thanks for your comments. And thanks for your educative postings Dave. I have read both about fake daggers and tried to match this dagger with every possible flaw you have pointed.
I am also in doubt about the leather. Here are some extra pics of the scabbard and the blade.

nazidagger9.jpg (38.79 KB, 253 downloads)
nazidagger10.jpg (41.32 KB, 253 downloads)