All About Pocket Knives

I started collecting vintage novelty pocket knifes because I used to have a Flash Gordon one when I was younger and saw one on E-bay. They make a eye catching display as well as bring back memories. Most of the pocket knives that I have are stamped with USA on the blade but 2 of the 19 that I have so far have Novelty on them. Are USA and Novelty the same company? Also, does anyone know where I can find a list of what either or both companies made? Most of the ones I have are space related and old movie, western stars. I have seen some baseball ones too but not really interested in those. I would appreciate any information.

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I have a few of them with Westerns and some with famous baseball players. I believe most were made by Imperial and Colonial during the 1940s-50s. I think even Camillus made a few of these knives.