If the model number isn't marked somewhere on the gun, it's pretty hard to determine exactly which Stevens double you have since they made at least 60 different models in three basic configurations - side hammer, back hammer, and hammerless. I can tell you that the "arms & tool" version of the company name was used from 1886 to 1916. If has a hammerless boxlock action, it was made after 1903.
The Riverside model number will be identical to the Stevens number.
By listing your serial number,and the model number with the caliber your shotguns was chambered in.please include this in your question.
i am not 100 percent sure but i think it would be found on the barrel.
your savage Stevens model 52a was made between 1933-1937 in the amount of 88,000 guns.
Parts for a Stevens Model 87A can be found at: http://www.e-gunparts.com/productschem.asp?chrMasterModel=089Zz87A
I can't find production dates for a model 357, but if it is marked J Stevens Arms Co (NOT J. Stevens and Co or J. Stevens Arms & Tool Co), the gun was made no earlier than 1920 and before 1950.
Depending on the model number and which part (you will need to know that) try gunpartscorp.com. Otherwise, visit a gunsmith.
Wasn't required to have one. firstname.lastname@example.org
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.
Stevens model 82 by the J Stevens arms co. made between 1935-1939.