103.-- on a Sears Roebuck gun indicates manufacture by Marlin. I don't find a 103.7, but 103.72 and 103.74 are listed as Marlin Model 59.
Brophy in his book, Marlin Firearms, a history of the guns and the Company that made them, published in 1989 by Stackpole Books, lists the Sears Ranger 103-7 as a 16 ga. Marlin Model 90 O/U shotgun.
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