You have an Ithaca Miner model made in 1907 if it is a sxs double not stated in the ques.
You have a Ithaca Model 49 Saddle Gun which was mfg between 1962-1978.
double 12 ga
We can't tell from a serial number alone.
You have an Ithaca Flues model made in 1920 if it is a sxs doubel not stated in your ques.
You have an Ithaca Miner model made in 1907 if it is a sxs double not stated in your ques
You have an Ithaca Baker model made in 1886 if it is a sxs double not stated in your ques
You have an Ithaca Flues model made in 1917 if it is a sxs double not stated in your ques
You have an Ithaca Flues model made in 1917 if it is a sxs double not stated in your ques
You have an Ithaca Flues model made in 1917 if it is a sxs double not stated in your ques
You have an Ithaca Flues model made in 1917 if it is a sxs double not stated in your ques.
You have an Ithaca NID model made in 1929 if it is a sxs double not stated in your ques
There's a list of serial numbers by year at http://ithacagunrepair.com/page5/page23/