Browning never made a Model 50 pump action shotgun. Please email us with the exact markings on the shotgun and we can identify it for you and give you some more information.
Dupont Lighters Official Website
This is one of the many guns that Sears sold under the Ranger name made by several different manufacturers. FN/Browning never sold guns to be marketed by department store chains. Your shotgun says 'Browning' because of a model made on Browning's Patent. Likely it is a Stevens built gun.
St Dupont Lighter Serial Number Database
No matter which model it is, these guns typically sell in the $100-$250 range depending on condition. If you provided the Sears model number, it could be cross-referenced to determine who the maker is and the years they made the gun. An exact year would likely never be known. Depends on the date and condition. In general star notes carry asmall premium if they're in decent condition. If the series itselfis rare (and modern 50s are not) a star note can be worth a lotmore than face value.