We used to use our imaginations while made the programs become real!
The normal way to identify a radio is by manufacturer and model number (for example, "Zenith 7G605" or "Philco 42-350"). Model numbers can include any combination of letters and numbers, and they may be long or short, although most are from two to six characters in length.
There is no standardization whatsoever for model numbers. Every manufacturer was free to make up its own scheme, and often a given manufacturer would change its numbering scheme over the years.
Model numbers are often printed on a paper label attached to the back, inside, or bottom of the radio cabinet. The label usually contains other information, such as a serial number, tube diagram, or even a complete schematic diagram.