How to open up an old pocket watch case, screw on and snap on

I think I covered all of the different types of cases. If I see you use a sharp knife to open a case I will slap you silly. To win nothing name the maker of each watch. Answer might be listed if I watch this video again because right now I don’t remember the makers names. This video performed by an amateur. Do not attempt at home. No watches were harmed in the making of this video. For entertainment only.