Good to see this thread revived , and cool to see there are other fans of the Outsiders around. That newspaper article is interesting. I'd like to have a switchblade like Johnny, but unfortunately they are illegal in my country (The Netherlands)
Because we only get to see Johnny's knife for a split second in the movie, it is hard to tell what it is. But after doing a lot of research,I found that Johnny's blade in the movie is a german shell puller lever lock, and they don't come cheep.
Of course if your looking for another knife from the movie , two-bit's blade the " butterfly " knife is a Pre Benchmade "BALI SONG" brand butterfly knife I heard was made in the USA in the 70s.
F.I.Y. Pretty sure there illegal in the states. Anything over 4 inches i believe.
Hope that helps! If anyone finds any good deals let me know!