Short of calling Savage Arms which took over Stevens with the serial number if it has one, the 322 was produced between 1947 and 1950. An A model would be likely 1947-1948.
Old catalogs, old gun books.
Exactly how is the gun marked? sales@countrygunsmith.net
The book the abandond by amanda stevens' age group is 9-12
Manufactured from 1932 to 1948
your savage Stevens model 94c was made from 1926-1945,there were 934,000 made during this timespan.
Durham Stevens died on March 25, 1908 at the age of 57.
The stevens model 258 was made during the years 1936-1945.
Ted Stevens died on August 9, 2010 at the age of 86.
If it has both the Stevens and Savage names on it, it was made between 1948 and 1991. Any gunsmith should be able to find parts for it, or you can try Numrich Gunparts.
As Stevens has changed hands many times you will need to find the complete manufacturers name, such as; Springfield, SE Stevens Company (Tool Company) etc. Info is really hard to find but what I've found out is a Stevens shot guns value is between $150 and $300, with the 12ga at the bottom end and the .410ga at the high end.
The serial number range for the Stevens model 520-30 military shotguns is from 30,000-70,000.As to the year of manufacture you will probably have to contact Savage/Stevens directly.
Depending on condition of metal and wood, Stevens double .410s of any age tend to bring in the $300 to $600 range.