Actually at some point in time, Savage initiated a policy that if a Philadelphia era Ansley H. Fox gun was sent in for repair, first they would measure the barrels and if they met their specs, they would rechamber to 2 3/4 inch and proof test them at the owners risk. If they passed they would then do the requested work. That is how we end up with Philadelphia barrels marked like this --
If the barrels didn't meet their requirements or failed proof, they would be destroyed, and Savage would fit a new set of barrels at 10% off list as a matter of customer good will. Leading to guns like this --
three-digit serial number gun.
Or this early 1920s 20-gauge --
