Some people claim a .410 double is worth up to $500, but it would have to be like new with the original $15 price tag still attached. More likely to bring about half that much if still functional and not too badly worn. That 1915 is most likely a patent date and the gun could have been made in the 1950's or even later.
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In very good condition 450-600 dollars.
A SxS in useable but not like-new condition will bring between $100 and $250. A 20 gauge or .410 will be in the mid to upper part of that range and a 12 or 16 gauge in the lower to middle part.
Like any other .410, it would be used for hunting small game, like rabbits or dove, or dispatching small preditors like possums or skunks around the hen house. And you don't have a 3 digit serial number - that will just be a manufacturer's batch number or part number. Value will vary by condition, but if it is a single shot, it is worth $35 to $75, or if it is a double barrel it will bring $100-$250.
The answer depends on the value of A.
$250.00