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The Riverside model number will be identical to the Stevens number.
It won't have one. There may be some numbers under the barrel on the forearm, but they will not be serial numbers.
Try your local gunsmith. The Riverside is a Stevens shotgun. If you can find out which model it is, you can probably find the wood at Numrich Gunparts
80 years plus or minus...
Requires in person examination.
Euro made. Get an appraisal
I have a 1913 model 16 ga riverside arms shotgun . all it says , is the date made and company so on mine there is no ga. indication .
riverside arms co. split single shot gun
Serial numbers were not required before 1968. If it has one, check under the forearm, on the barrel and on the action.
i have a forearm for a model 49 email me to know more huntinskip@yahoo.com
Stevens/Savage used the Riverside name from about 1920 to 1945.
This weapon will need to be appraised and compared against known samples.