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Blue Book of Gun Values might help
There are far too many to list in Wiki Answers. Get a book.
A breakdown of the parts for a Stevens Savage Arms Model 9478 is found in the book The Gun Digest Book of Firearms Assembly/Disassembly Part V - Shotgun. It has exploded views of the stock and its availability on the market.
The Stevens Model 94 in 16 gauge has a value from $40 to $90 depending on condition, according to the "Blue Book of Gun Values" 25th edition.
According to the blue Book of Gun Values (25th edition),this shotgun was built from 1933-1945.
Blue Book of Gun Values will help.
The Standard Catalog lists it at $200 in NRA Poor condition and $500 in Excellent. The Blue Book doesn't seem to list this model, but similar Stevens doubles (there are about 3 dozen models that have no significant differences) are shown at $100 in 60% and $225 in 100%. Now, BB 60% is better than NRA Poor and 100% is better than Excellent, so one of them is seriously off in their estimations. I think the Blue Book is a bit low and the Catalog is way too high. The Stevens 325 sxs shotgun was made from 1904 to 1908. Not many people know about this shotgun and it is often confused with the later made model 325 bolt action rifle.
E DATE CODE IS 1953 VALUE IS 100FAIR,125GD,150V.G, AND 200EXC. I GOT THIS FROM THE BLUE BOOK GUN GUIDE.
Elisha Stevens has written: 'Elisha Stevens, fragments of memoranda' -- subject(s): Accessible book, History, Personal narratives
If you check the blue book you will find that it was manufactured between 1926 and 1935. The Savage Arms website will tell you how to contact an independent Stevens historian who MAY be able to narrow that date range for a fee.
According to the Blue Book, the Stevens No. 75 was manufactured from 1928 to 1934. Total production about 19,000.
The only date listed for the Stevens 94 in the Blue Book was 1929 The chart in the back of the Blue Book says 934,000 model 94's were made between 1926 and 1945. I don't know what was different about the A series or if the 94 was discontinued when the 94-A was introduced, but I'd wager it is some cosmetic difference that they could charge an extra dollar for and both were made during the same period.