$60 to $100
Savage/Stevens made a lot shotguns with the Riverside name and Browning patented a lot of guns, features, and improvements. Give a model name or number and describe the action (automatic, slide, etc) and we may be able to give a ballpark estimate.
This should be a Stevens shotgun made on Brownings patent. Typically these guns sell in the $150-$300 range.
50-200 usd
You will have to call Browning to find out.
Gun Digest.
There was a Browning 12 gauge with the patent 2203378-223386, that was sold for $999.00 at an online auction.
Go to the Browning website, look under Customer Service. You will need the serial number, not a patent number.
OK, what is your question?
Stevens 520 pump
I would have to assume that you have a semi-auto shotgun.If your shotgun has a slight hump to the back of the reciever then it was a shotgun made with a browning patent and would have to be listed on the gun along with the royaltys paid to his patent.
Serial number on a Citori is under the breakdown lever on the receiver. It should also be stamped on the barrel where it locks up on the receiver.
Can't be answered without a detailed description of the weapon.