Union Arms Co was a trade name distributed by H&D Folsom of New York c. 1900. I find sources that attribute these guns to Henri Pieper of Belgium and other sources say Crescent Firearms (owned by Folsom) of Norwich, CT. Folsom would order guns from whoever offered the best price at the time, so without some additional markings, it is impossible to say for certain who manufactured a particular gun. Crescent was by far the most prolific producer of these store-brand shotguns. There is a list of over 100 trade names found on Crescent guns in the Standard Catalog of Firearms. This list is still growing, and many of the names are also found on guns made by Davenport, Davis, Stevens, Iver Johnson, and others.
You can find a brief history of Warner Arms Co in The Standard Catalog of Firearms or other reference books.
Union Fire Arms Company of Toledo, Ohio manufactured low end shotguns in 12 and 16 gauge in single, double and pump. I have a 16 gauge pump action. My impression is that in good condition they go for around a hundred dollars. My impression (again) is that the order of value is sxs doubles, then pump action, then single shot. A search engine shows much more about company history and other topics.
its an old gun from sears. inexpensive back then. worth about $125 bucks.
Try gunstocksinc.com good luck
$125 - $150 as a mantle decoration.
this gun is a 16gauge pump mfg. by Stevens arms. would like some history on gun
12 gauge Springfield Arms 1916
Manufactured sometime between 1920 and 1948.
as your looking down the gun, the gauge should be stamped on the left barrel back by the stock.