Roy Weatherby started off building custom rifles. He would use whatever action the customer provided/specified. The styling of the stock is similar to the rifles that came out of Cali in the 40's and 50's. I would bet a dollar this is an early example of a weatherby custom gun from pre 1950.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball