You have an Ithaca Flues model made in 1919 if it is a sxs double, not stated in your ques. Can not provide additional information without the stampings on the water table, barrel flats, and condition.
You can tell how old your Ithaca gun is by the model and serial number
100-1000 USD
What is the condition of the gun and the barrel length?
By the serial #
You have a Ithaca Model 49 Saddle Gun which was mfg between 1962-1978.
By the serial #
It was made in 1924, according to "Ithaca Gun Company - From the Beginning". Value would be determined by GA, model, and condition.
No way to answer. Serial numbers do not work that way.
You need to provide the serial number.
Impossible to answer without the serial number
1905
Look in "The Ithaca Gun Company - From the Beginning"