It is a Stevens shotgun, based on a Browning patent. Inexpensive.
You will have to carefully note exactly how the gun is marked, first.
The barrel will be marked "Made in Belgium"
It will be marked on the receiver/barrel.
It will be marked on the receiver. It was made in 1980
This Shotgun was made by Stevens their model. 520. Made from 1930's to 1950'S Although the shotgun was Browning patent marked, it was not made by Browning.
It will be marked on the barrel.
The Stevens Model 520 was built on a Browning patent and so marked. Stevens also built the gun for Sears before World War II under the 'Ranger' tradename, so if you have a slide-action shotgun marked 'Ranger' and 'Browning Patent' then that is what you have.
It will be marked on the botton of the receiver.
It will be marked on the weapon.
It will be marked on the receiver/barrel where it was made.
Where will be marked on the barrel/receiver.
Should be marked on the barrel