How to tell how much a sword is worth?

Question

About 10 years ago I bought a car and in the trunk was an old katana. I just took it out and I'm wondering how old it really is. How do you tell? Is there a book or website that helps identify worth and age?

Its got about a 3 foot blade thats detachable, and the grip is made of leather nailed (nails look really old) to a wooden handle.

Answer 1

you'd better visit an antique professor.