Need a bit more description. Is this a pistol? If so, do you have a detachable wire stock for it? Would the description "tip-up" action seem appropriate for the method of loading it? These were called "pocket shotguns" and their status with the BATF is questionable if the barrel is less than 18" or the gun is less than 26" long without the stock. A few of the Stevens Favorite and Ideal models were also made with a smoothbore for shot shells.
Have it examined by a gunsmith.
it was made approx. 1896-1916
The Stevens No. 16, also marked Crack Shot, was manufactured between 1900 and 1913.
Your Stevens model 200 shotgun was produced around circa 1910.
MOST of the single shot shotguns do not have really high values. The Stevens is a good gun- dependable, reliable, well made- but not a lot of collector interest. Depending on condition, a Stevens single may be worth between $50-$175. I keep a few of the singles around as loaner guns to new shooters- they are a very good shotgun for a "first shotgun".
I dont know age, but worth about $65
Many of the shot guns are valued in price close to $500 each. The amount will vary depending upon the condition that it is in.
This rifle was known as the 44 and a half and is very desirable to most gun collectors. This piece if in good condition will bring between $400 and $900.
J.Stevens Arms and Tool Co - the company that made the gun Electrosteel - Stevens trade name to make you think it's better than others. Choke bored - Barrel is restricted at the muzzle to hold a tighter shot pattern.
The "Arms & Tool" was part of the Stevens name from 1886 to 1915. A .410 would not have been produced prior to 1900. A single shot would be worth $50-$90 or a double barrel $100 to $300. Is it marked ".410"? A .410 shell would fit in an older model chambered for the shorter .44-shot cartridge, but should not be fired in one. Some of the Stevens Favorites and Ideals were available in this chambering and although they aren't worth very much if well-used, they can get pretty pricey if approaching like-new condition.
Marked with that version of the company name, it would have been made between 1886 and 1916.