The model names for this truck were C-500, C-600, C-700, C-800, and C-900. There was also a C-900 Big Job model. Some features, such as emergency flashers, were only available on fire truck models that were sold to fire departments. A Super Duty and small sleeper cab option was added for 1961.
The Cargo series introduced in the late 80's outsold the C-series, spelling out its demise.
These trucks are still desireable among a select group of old truck collectors. You can often find more information about them using Google, and if you check on eBay there is usually one or two for sale. There are also often parts available there, and with any big old truck there is a constant search for better or working parts.