I believe that it was made in 1938. The value depends a lot on its condition. Generally a 16 GA is worth more than a 12 GA. If in very good condition it is probably worth $400 - $500. Check on www.gunbroker.com to see if any similar guns are listed.
1938-39
It sounds to me that you have a Ithaca Flues model double barrel shotgun.With the serial number that you provided,your shotgun was made by Ithaca in 1917.
According with Ithaca's web page range 371453501 to 371536500 is from 1975.
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.
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.
The serial number that you provided indicates that you have a Ithaca Flues model double barrel shotgun that was made in the year 1925.I would have your shotgun appraised by someone who specializes in these shotguns because there are to many variables that would indicate a accurate price for your shotgun.
1985 371871501 - 371882000
It your shotgun a Model 37-S or 37-T ?
The value is 150 to 200 dollars and the age is 85 to 105 years.
Made in 1949
Made in 1968