And serial number for rifles and shotguns were not required by Federal law until the 1968 Gun Control Act.
For anyone else- Numrich Gun Parts Corp, e-Commerce Super Site
is the home page for Numrich guns parts. On the EMPLOYEE forum (left side- right side is public forum) scroll down, until you find cross reference. Allows you to cross a store brand (like Westernfield, JC Higgins) model number to the original make and model. Their data base is not perfect, but helpful in many cases.