Stanley Arms Co: Made in Belgium by F. Dumoulin & Co for Wiebusch & Hilger Co of New York City, circa 1904.
You can try searching online on gun forums, websites that specialize in firearms history, or contacting the manufacturer directly if they are still in business. Additionally, you can visit a local gun shop or gun show to see if there are any experts who can provide information on Stanley Arms shotguns.
Mississippi Arms Co was a trade name used by the H.D. Folsom Arms Company on firearms made for the Shapleigh Hardware Company of St. Louis, MO.
www.google.com
Most likely a store brand.
Contact information is listed on their website
The company that is listed in the related links IS NOT the Buffalo Arms in question that made Buffalo Arms Derringers. The company went out of business long ago, and there are no known websites, or information regarding them.
Stanley Motor Carriage Company ended in 1924.
Stanley Motor Carriage Company was created in 1902.
No known history published on this company
Blue book of gun values
Here's what little I can find in the Standard Catalog. Incorporated in 1902. Used the names Union Fire Arms, Union Arms Company, Illinois Arms Company and Bee Be Arms Company. In 1917 the company was either bought up or absorbed by Ithaca Gun Company. They manufactured slide action shotguns, hammerless doubles, a few single shot shotguns, and a couple semi-automatic pistols.
This was a trade name distributed by Shapleigh Hardware of St Louis on shotguns made by Crescent Fire Arms (1892-1931) and J. Stevens Arms and Tool Company (1886-1916).