it is a nice dagger, that you show! Has it got a flat, lightly hollow grind on the back of the blade and the front is like a triangular?
I assume you have an "Iron Eagle" Fighting Dagger, made in Seki/Japan. In Germany sold in the year 2001/2002 by HALLER MESSER, it was made from steel 440. It reminds a little bit at a BlackJack "Tartan Dirk", but only a little bit and only on the first view.