Even a decade later, I as a high school student really into photography wasn't getting a Nikon. Started with my dad's Pony and then Retina and then used a Konica system through university and beyond until it was stolen in a break-in.
I understand they were either the first, or at least very early, to take standard cinema film (35mm) and run with it. Were the press some of the early adopters? (Tired of lugging their monstrous Graflex cameras around.)
No, that was Leitz (Leica). Nikon didn’t start making cameras at all until 1948. Their first cameras were rangefinders, sort of a cross between a Contax and a Leica. They were very good (some of my very favorite cameras), but not super popular.
Their first SLR, the Nikon F, came out in 1959 and quickly became a sensation with professionals. They’re built like tanks, and still very usable.