Side-by-side shotguns are still manufactured.
If this is an old side by side it would be a Baker model made in 1886. Serial numbers of Ithaca shotguns for that year were 2448 - 4101.
Shotguns break open, not over. Winchester, Stevens, Ithaca have made 410s
Ithaca Gun Company of Ithaca, New York was the manufacturer. "Flues" refers to the designer. These double barrel, two-trigger, side-by-side shotguns were made from 1908 - 1926. Check out http://ithacagunrepair.com/page5/page23/ for a list of serial numbers by year of manufacture.
It stands for Side by Side in double barreled shotguns.
Not currently produced. Start with your local gun shop.
You have an Ithaca sxs Miner model made 1907.
I don't know the answer, but I know where you can find it. Check your library for "The Ithaca Gun Company - From the Beginning" by Walter Snyder. There's a list of serial numbers that are verified as being Ithaca shotguns owned and used by Wells Fargo Company. Since thousands of cheap shotguns have had fake WF&Co marks added, about the only one's that will bring a premium from advanced collectors (of firearms or Wels Fargo memorabilia) are the ones listed there.
The Ithaca side by side 12 gauge serial 188650 was made in 1927.
Look in "The Ithaca Gun Company - From the Beginning"
You have an Ithaca sxs Flues model made in 1919.
It is an Ithaca model NID made in 1926