The Freedom Group.
Crescent Arms made 100's of inexpensive guns under several brand names. American Gun Co was one of them.
Colt, Remington, Savage, Smith & Wesson, Barrett, Henry- and many others.
American Airlines, Virgin America, and Delta Airlines are companies who provide flight deals.
Could you give a little more information? You've posted under American Gun Company, but these were made by Crescent Arms and that company never made an over/under shotgun. There have been several companies with "American" in their names. One good possibility is American Arms, Inc., an importer of Spanish and Italian shotguns from about 1985 to 2000.
There are many companies that were founded or do business in America. Three American company names are the Ford Motor Company, The Coca-Cola Bottling Company, and Zevia LLC.
American Gun Company was one of over a hundred names used on Crescent firearms. Crescent was in business 1888-1931. Most of their double shotguns seem to date from 1900-1930. There are simply no production records.
Every American car company produces minivans. Some American minivans are the Dodge Caravan, the Plymouth Voyaguer and the Chevy Astro Van.
No way to give you an exact answer,due to no records. American Gun was owned by H&D Folsom Arms Co., 314 Broadway, New York City, from about 1893 to 1930. They made a lot of very low priced shotguns for H&D Folsom to market under the American Gun Co. and the Crescent Fire Arms Co. names.
American Ballet Theatre (ABT), Joffery Ballet, and New York City Ballet
provide some good names of galvanized companies
The American Gun Mystery was created in 1933.