You need to provide a lot more information. For instance - is the gun a double barrel, semiautomatic, or a pump? If you are interested in learning its value, you also need to provide its GA (12, 20, 16, .410) and condition. If it's a double, it is probably a 1916 Flues or NIG model.
You can tell how old your Ithaca gun is by the model and serial number
No way to answer. Serial numbers do not work that way.
I think you must be the same person who just asked about the gun, providing only the serial number. Since there was no other information, the question was answered assuming it was a shotgun. However - if it is a .22, you need to let us know whether it is a single shot lever action, a lever action repeater, a clip-fed rifle, or a pistol - all of which were sold by Ithaca in .22 cal.
We can't tell from a serial number alone.
You have a Ithaca Model 49 Saddle Gun which was mfg between 1962-1978.
1905
Impossible to answer without the serial number
You need to provide the serial number.
Look in "The Ithaca Gun Company - From the Beginning"
double 12 ga
No way to tell from SN only.
The serial number indicates your gun was made in 1955.