Jimmy's last two sentences explain Sven's gun. As Jimmy says, Simmons bought new Model 12s and 42s with plain barrels from Winchester, installed ribs and often stamped proof marks in the proper place and sold them through the Simmons catalog. They are known as "Simmons marketed" Winchesters. Such Model 42s are almost as collectable as factory Winchesters. Model 12s are somewhat less marketable, because many Model 12s were plain barrel guns and most Simmons ribbed Model 12s are aftermarket, not Simmons marketed. A Model 42 Skeet with plain barrel is a rare bird by the fifties and Simmons was the only source, so a Simmons ribbed Skeet Grade 42 in the fifties serial number range is likely not an aftermarket installation, but a Simmons marketed gun or a real Winchester factory gun. By the fifties, Simmons had bought all the Model 42 plain skeet barrels and Winchester hadn't made one in that configuration for years.
