Ithaca really only made one model of double-barrel at any given time. Certain design changes have been called as different models (Flues, Crass, etc) and that can be determined by serial number. Also, the grade designation on the water table is important. sales@countrygunsmith.net
I have an Ithaca model 100 shotgun . It appraised for $700.
You have an Ithaca sxs Miner model made 1907.
It is an Ithaca model NID made in 1926
You have an Ithaca sxs Flues model made in 1919.
You have a Lewis or NIG model, built in 1903.
The double is the last model NID (New Ithaca Double) mfg by Ithaca. This one was mfg in 1927. Depending on condition and gauge you may have a very desirable shotgun.
Known as the 'Minier Model' and made 1906-1908. sales@countrygunsmith.net
about 400 dollars
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.
The gun was made in 1902, and is a late 'Crass' Model. sales@countrygunsmith.net
This ia an Ithaca Gun Co. "Crass" model double and was made in 1896. REFERENCE: the Reference Center pages at www.ithacagunrepair.com - 02-16-07 SPR.
You have an Ithaca sxs NID Model made in 1927. Without additional information stamped on the watertable and on the barrel flats I can not provide more.