Here is a real answer to your question. Robertshaw made and still makes stove parts such as thermostats, valves, thermocouples etc. for stoves. ( they also still make heat and air parts) So the name on your knob is the mfg. of the thermostat. The name brand of the stove should be on a metal tag some where on the stove. Most of the time under the cook top or in the storage area.
We hope this some what answers your question.
Antique Gas Stoves