Welcome to the forum hotknives.
I am sorry to say that my gut reaction is not good. It has the basic look of a European dagger from the C16th or earlier. BUT it doesn't feel right to me, a few little things but mostly the blade looks wrong; not enough 'shaping' or 'work' things like fullers or a central rib.

I suspect it is a modern piece that has been aged, though there was also a lot of that kind of thing from the C19th so it might be a bit older than I am guessing.
Of course I could be well out, it's very tough to give a definitive answer without getting to hold it.
