The Ithaca side by side 12 gauge serial 188650 was made in 1927.
You have an Ithaca sxs Flues model made in 1919.
It is an Ithaca model NID made in 1926
According to a table in "Ithaca Gun Company from the Beginning" it was made in 1901.
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.
bout 50-100 years old
You have a Lewis or NIG model, built in 1903.
I would say that you have a Ithaca model flues double barrel shotgun that was made in the year 1923,with the serial number that you provided.
Forearm iron and watertable are the easiest places to obtain this info
The gauge is stamped on the water table by the serial number. It is a Flues model made in 1924.
Made in 1925