If it has both the Stevens and Savage names on it, then it was manufactured after 1945 and before 1969.
We cannot tell from a serial number alone. You might check with Savage Firearms customer service (They own the Stevens brand)
What is your serial number?
Cannot be answered without the inclusion of the serial number.
While I cannot state the exact year of your Stevens model 520 production,I can say that this model of shotgun was made from 1912-1932.Stevens/Savage made 191,000 during these years
These savage/stevens model 94c were made from 1929-1942.long before serial numbers were mandated by the gun control act of 1968.So there is a strong possability that your stevens does noy have a serial number.
Your stevens model 9478 was made by savage/stevens between the years 1978-1985.
Not much in the way of serial number data on Stevens guns. Check with the customer service staff at Savage Arms- Stevens has been part of the Savage brand for nearly 100 years. http://www.savagearms.com/customer-support/
the savage/stevens no125 was made from 1912-1923,there were 5,000 made.
The Stevens Savage Model 124 12 gauge shotgun was made from 1949 to 1954. The serial number will signify the actual year of manufacture.
The savage/stevens model 72 crackshot .22cal rifle was made by savage during the years 1972-1989.
If it has both the Stevens and Savage names it was made sometime after the mid 1940's. If it has no serial number, it was made before 1969.