There are basic 3 types of bow tie – self-tie (photo 1& 2), clip-on (photo 3) and pre-tied (photo 4&5). No self-respecting man should buy a ready-made bow tie; they are only for children. So, kindly go for a self-tie one. Even the clip-on is not for grown-ups as it also tends to lend a look that's too perfect.
James Bond in this photo is wearing a self-tied bow tie.