Howdy
Stevens Arms was incorporated in Chicopee Falls, Massachusetts in 1864. Chicopee is near Springfield. In 1864 the name was changed to J. Stevens and Company. In 1886, the company was reorganized and incorporated as J. Stevens Arms & Tool Co. The company went through several other names until it was bought by Savage in 1920. Savage was in nearby Springfield, so this made a lot of sense. The Stevens Favorite was a very popular 22 Rimfire single shot boy's rifle. Stevens made a great variety of pistols and shotguns too.
I have three or four Stevens shoguns, my favorite is this 12 gauge hammer gun from around 1908 or so.
Here is a closeup of the left side plate with the J. Stevens Arms & Tool Co name on it, with the location underneath.
I have taken photos of two pages from Jay Kimmel's book,
Savage & Stevens Arms.
These are reproductions from the 1929 Stevens catalog.
The first page shows the #107 shotgun. It was available chambered for 12, 16, 20, 28 gauges and .410. This model had an automatic Ejector, meaning when you broke it open the shell was ejected. The Model 105 was similar, but did not have the automatic ejector. The Model 108 at the bottom of the page was for 410 and some other calibers. The Model 108 had the automatic ejector, the Model 106 did hot have the automatic ejector.
Sorry, the page was curled when I took this photo. It looks like the Model 115 was a higher grade model than the previous ones.
Hope you can figure out what you have with this information. No idea if it is safe to shoot without first hand inspection.