Let’s say that under the heading of vehicles we have cars, trucks, vans, busses, and so on. Ok, let’s imagine Southern Mountain rifles are passenger cars in this analogy. A Soddy Daisy would be in a subset, made in a certain region at a certain time, to a particular style. Like a VW bug made from 1950-1968 for example. Easily recognized by those who are interested in German cars of that period.
Soddy Daisy is a region of Tennessee where a specific style of SMR developed. It’s architecture through the buttstock is easily recognizable especially on the cheekpiece side.