I'm new to collecting would anyone know what case my newly acquired Hamilton 950B S20134 should have? Model,screw back?,Hamilton or wadsworth etc. Any help would be greatly appreciated.

The "classic" examples for your 1953 movement would be Hamilton marked Keystone Model "A" case with a serial No range of K365000-K380000 or a Wadsworth Model "2" Bar-Over-Crown case with a serial No range of J375000-J400000. They are both "screw back & bezel" type cases.

regards,
bb

Thanks so much the info was very helpful b

James Welcome to IHC 185 , there is a wealth of knowledge here !