You can tell how old your Ithaca gun is by the model and serial number
Its an Ithaca Flues model made in 1921
Its an Ithaca Flues model made in 1921
If that is an old double barrel "New Ithaca Double" it was made in 1926.
You have an Ithaca Miner model made in 1907
the age of a 12 gauge Ithaca is : 47,000 years old .
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.
Made in 1949
Late 60s to early 70s
1949 production of Ithaca 37's began with serial 202951 and ended with 302500.
Your serial number indicates that you have a Ithaca crass model double,that was made in 1903.
I cannot find a serial number that high in any of my Ithaca references. The link below will take you to a good summary of serial numbers for Ithaca shotguns, you may be able to find your model and date there-