Riverside was manufactured by Stevens, so if you can identify the equivalent Stevens model, you should be able to find hammers at http://www.e-gunparts.com/ Or if you still have one hammer (or a broken one) you can take it to a local gunshow and dig through bins of miscellaneous parts looking for a match.
riverside arms co. split single shot gun
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
Stevens/Savage used the Riverside name from about 1920 to 1945.
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 .
no . riverside was mainly produced after 1914, using fluid steel barrels.
Can't give you an exact date, but Stevens used the Riverside name from about 1920-1945 according to my notes.
Depends on what is marked on the gun.
The Model 215, a hammer gun, and the model 315, a hammerless
Should be priceless to you, but to the rest of the world, $50-$125.