As far as "value" goes. Well it has been said on here before... A sword is worth what someone will pay for it. Value, to you of course, is EZer to determine IMO.
Looks like a really nice sword. I love the O-kissaki, and i can see nie, and what might be kinsuji in your photos. It looks as if this sword would show some nice activity upon close inspection, and if it were mine i would probably put myself on someone's list to get it into full polish.
I have not studied enough hands on to even take a guess at time period on this. Well i could guess, but it would be just that, a guess.
-Donovan