My guns is very like a Stevens 520 "double hump back". Later ones had a straight topped receiver. They were sold by Wards and Sears. Sears guns were usually called "Ranger" and are so marked. Some were used as riot guns by the military during WWII.
Apparently it will slam fire like early Model 12s. The safety is a lever right front of the trigger inside the trigger guard. Different, but easy to find!
Anyway, thanks gents for all of your help. Oh, it's a 2 3/4 gun and all of them were. Stevens made a highly engraved $100 model. They also made 28, 30 and 32 inch tubes, mine is a 30 which is what they all came in unless a special order.
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