I would look at the number of barrels. If there is more than one barrel, you know you have at least a double barrel shotgun. If there are 1 or less barrels, then you don't.
50-100 USD
The name and address of you 410 should be printed on the barrell of you firearm.
The gun was made around the turn of the century(1900).
Over the past 100 years, many makers have made double barrel 410 shotguns. Provide a detailed description of ALL markings, barrel length, finish,etc., and some one might be able to help you.
Unknown.
Gun store, auction sites, pawn shop, local ads.
Sporting goods store, gun shop, pawn shop, gun show, or KMart if they still sell firearms in your city.
Worth some money 1-5K
You have a winner! The .410 is a rather rare gun. Worth $5-$600 if in excellent shape.
There is no way to determine the gauge without seeing the gun. Assuming it is one of the standard gauges, you can measure the inside of the barrel. 12 gauge is .729", 16 is .662, 20 is .615, and a 410 is .410.
I would like to buy this gun for my father in law. Anthony.hickox@gmail.com
100 plus or minus a few decades; 40-140