I was recently given a Benchmade Balisong Knife. I was told it is a model 10. Even got the Benchmade nylon case with it. Only flaw was that I had to replace the T latch. Looks mint otherwise. The butterfly on one side of the blade has Balisong written in it. The other side of blade has Benchmade with USA under that. Years produced? Value? Thanks for your help.