The Ranger name was used by Sears Roebuck in the 1940's and 50's. I don't show your exact model number in my cross-reference lists, but 103.x was marked on their firearms made by Marlin.
According to Brophy in his Book on Marlin Firearms, Sears used the Ranger name prior to WWII on the gun that Marlin sold as the Model 90 o/u shotgun starting in 1937. After WWII Sears used the JC Higgins name on the gun.
If there is no serial number, it was made or imported before 1968. The SN may be on the inside of the receiver, the outside, or on one of the tangs. Good quality guns always had serial numbers, and if you have the manufacturer, model and SN, there are online references that can date it for you. Search for "Manufacturer shotgun year of production" and you should get a good result.
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