As I recall it was a really cheap Italian switchblade, with hollow plastic handle scales, about 3/32" thick blade, with a swing out guard, and the blade lock controlled by the opening button. I doubt that they made them that flimsy back in the 1930's when the movie was supposed to take place. I saw a lot of them in the 1960's. I had a couple of them. The steel was about 52 RC.