Library, internet, gun shows.
You probably can't as all the manufacturing & importing records for the H & D Folsom Arms Co. and its subsidiary Cresent Arms, who apparently made this firearm, have been either lost or destroyed. The Carolina Arms Co. was the name stamped on firearns by Folsom for the Smith-Wadsworth Hdw. Co. of Charlotte, N.C. The above info. comes from a source that admits that this info. is somewhat foggy.
Highly unlikely that sn info is available. Highly unlikely that sn info is available.
There's SOME info here; http://www.scripophily.net/hoalarcoma19.html FriPilot
where can i find a stock for a bayard arms 12ga.double barrel
Richland Arms was an importer in the early 70's
Hero Arms Co. single shot 12 guage shotgun is a trade name. Research show. A Hardware company in Pennsyvania sold the Hero Arms. Guns America online auction shows several Hero Arms shotguns going for 75 to 100 dollars.
Some models of Diamond Arms were made by the Crescent Fire Arms Company for the Shapleigh Hardware Company of St, Louis, Mo. between 1982 and about 1922.
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You can find a brief history of Warner Arms Co in The Standard Catalog of Firearms or other reference books.
You can find information like age and the worth of a product on a J.stevens Arms and Tool Co browning pat from the info engraved on it.