I have a prototype T13 Beano Hand Granade made by the Eastman Kodak Company during World War 2. It was given to me by my Grandfather who was part of the design team. It has never been loaded with powder and is completly inert and in like new condition. I have heard it is very valuable and I am trying to get a value on it. Once I can get an accurate value I plan to sell it. Can anyone help me?