Back in the day, there were dozens and dozens of importers. Even the large retailers had their names on some of the guns they sold. I have a Zouave stamped Sears Roebuck & Co. (in addition to Antonio Zoli) Dixie sold Griswold and Gunnison repros for many years. The repro rev collectors site is doing a good job trying to document the different guns. It would be nice if the same could be done for long guns.
When i worked at a sporting goods chain the late 1970's, there were several dozen importers of black powder guns from all over the world. Guns made in China, Japan, the US, Spain, Italy and Belgium. FIE, EMF, Lyman, H&R, Ultra Hi, Hopkins and Allen, Numrich, Navy Arms, Century Arms, Western Arms, Euro Arms, Centaur, Markham, CVA, Garrett Arms, Sears, I seem to recall seeing a Western Auto stamped gun.