Actually that is incorrect. The bolt may not be serial number STAMPED, but it is electropenciled with the serial number. Every on I have is and so are the Winchester 52's. They were handfitted and headspaced and then numbered.

As to parkerizing, yes the MILITARY ordered and had Winchester 75's parkerized. Some do, and some dont have the U.S. stamped or engraved on the rifle.