I know this is an older post, but I want to clarify a few things. One, the survival knives for Rambo 1 and 2 were not made by Gil Hibben, but Jimmy Lile. Second, in 1979/80, Timberline knives came out with hollow handle survival knives extremely similar to the First Blood Knife, down to cord wrapped handle and saw tooth spine. The blade shape was different though, basically Lile made it a clip point and larger with a 9 inch blade vs 7 1/2. By the time they started pre-production on the film, these survival knives already existed.