OK, I'll take a stab at it.
I don't think it's a Misericord. I would say more likely Naval or a dress dagger. It's a shame the chain and the other connection point on the pommel are missing. Still a very nice dagger and I for one like it a lot. Hopefully someone here on the forum that is more knowledgeable than I will answer and be able to tell you exactly what you have.
Robert