Built right here in Prescott, Arizona when Arizona was a hot bed for custom builders. You have what was at the time a close rival to Griffin and Howe, et.al. were building in their hayday in the twenties and thirties. A&M heyday were the 50's 60's and early 70's. I have had the pleasure of owning an A&M built on an early Savage 110 action. Does your rifle have the octagon recoil sleeve around the barrel? This was one of their trademark deals on Magnums. I also have had the pleasure of owning a 257 roberts built by Bill Sukalle of Phoenix. His gimmick was to make barrels from truck axles and the Buehler type safety was his invention. Still wish I had the Roberts. What you have is an exceptional example of a rifle custom built from that era. My guess is to extract max value,you would need to find a buyer specializing in A&M rifles. The refinements would be lost on your common Joe Blow rifle guy.