As CWL's link states, registered users, like you and me, cannot ask about the value of knives or any other item. Not for sale, resale, insurance, or estate purposes. Not for any reason.
As far as the identity of the knife, pictures help a lot. Sign up for one of the online image hosting sites, such as Photobucket, upload your pictures, then paste the link into your post.
Especially helpful will be large, clear pictures of any words or numbers on the blade or handles. Blade size, overall length, and handle material information help a lot, too.