I know very little about the value of knives so please help. My grandpa gave me this knife some years ago and I probably won't sell it , I just wondered what it is worth. It is a folding 2 bladed Knife , the blades are 4 inches , it has a white handle with a ship that says "the Mayflower 1620" on one side and an eagle with "liberty" and "Justice" on the other.The large blade says "Schade U.S.A. 261sc on it and the metal above the handle has 03306 on it. Thanks for any help.