Seems there are different opinions on what prewar is. Possibly diffent even by manufacture. Looking at the Blue book on Winchesters for example. I observed that Model 70's consider up to 1946 as prewar. 47 to 48 Transition and pre-64 after that. Model 42's no clarification on the year, but the call out prewar models being valued higher. We know they are referring to WWII because no 42's were made pre WWI.
I do believe quality for the most part does seem higher on Double Guns built up to the late teens.
