That is a tough one. Try writing to The American Rifleman (the NRA magazine) to see if they ever ran a disassembly article on the Flues model (although that is unlikely since the Flues was made from 1908 to 1926). You will likely have better luck contacting the Ithaca gun collector clubs and see if anyone ever drew one up. That may cost a few bucks.
If that is an old double barrel "New Ithaca Double" it was made in 1926.
Parker 12 ga muzzleloader
Gun shop, gun show, Shotgun News, Gun List
sawed-off double barreled 12 gauge Remington shotgun.
The double barreled red chieftain of course!
50-100 or so
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
Its an Ithaca Flues model made in 1921
Stephens
Its an Ithaca Flues model made in 1921
Assuming you mean an Ithaca double barreled shotgun, there were many diferent models, and they have different values. Some may be $200, some $2000. For any collector's gun, the condition plays a major role in the value. Sorry, you will need a hands on appraisal to get a tru value.
1896