Yes
your gun was made by Savage Stevens eary 50s 16 gauge guns with 36 inch barrels are not common . Its worth about 125 bucks
Most shot guns can handle deer slugs.
50-100 USD
Sometime in the first half of the 20th century.
Not sure what you mean by a "12 barrel." If it is a 12 inch long barrel, it has been cut off and is an illegal firearm. In any case, .410 single-shot Stevens guns bring $100 in top condition. sales@countrygunsmith.net
All guns should have the information stamped onto the barrel. Most of the time it is near the action. Look on the barrel of your shot gun and it should tell you the make, model, caliber (or in your case with a shot gun) the gauge, for shot guns the size of shell the gun takes, and finally the choke the shot gun has. If it is a screw on choke it should saw on it.
Sounds like one of the hundreds of store brand guns made around the turn of the century. Value seldom exceeds 100 USD.
10-100 USD or so
Blue Book of Gun Values is a good place to start.
Made by J Stevens Arms between 1920 and 1948.
made in usa
Around $25-$50. Likely origin is Belgium, STRONGLY advise that you do NOT attempt to fire it. That time frame covers guns made for black powder shells, not smokeless. The 16 gauge shell was shorter back then, and many of those guns used a Twist steel barrel.