Sorry for answering a bit late...

Youre right...it is a danish naval dagger. Dont remember exactly what model this is, but its 1900 something.
Denmark has a really, REALLY big variety of navy daggers, and in my opinion, they are all of great quality. Often german made. To collect danish daggers is a field in it self.
I really like those, and I have a bunch of them myself.
Models like this one usually go for about 350-400usd.

(Always looking for named/personalized/"altered" HJ knifes/bayos and Brannik/czech youth knifes)