The photos of the camera in Simmons's book are of a Cambo camera. Cambo is now owned by Calumet. Before it was superseded by more complex and feature-full cameras, the camera was known as some variant of the Cambo "SC." It was a professional grade camera. Later, in the U.S., the name was changed to Calumet "45NX" or "45N." Depending on the features. In the rest of the world, it is still the Cambo SC. It is now directed at beginners and for those on a tight budget. In talking to the folks at Calumet, I learned that there were different feature sets in the SC over the years, and that it might have had different names, like SC, or SC45 over time as well. Generally, the only differences are things like mm scales on the monorail, calibrations on the standards, etc.
The difference between the 45N and 45NX were that the NX had a longer monorail, nicer knobs on the controls, and a revolving back. The most recent variation, 45NX-II lost the revolving back. I can't remember the other change(s). My memory is that they just degraded the NX.