I have seen original Model 42s with Simmons marked ribs, but I have never seen an original Model 12 with Simmons markings on the rib. Many Model 12s and 42s were marketed through Simmons with Simmons marked ribs. These are a sub category for Winchester skeet gun collectors if the gun has features that suggest or prove they were marketed by Simmons when new. Simmons marketed Model 42s are much more accepted by collectors than are Simmons marketed Model 12s. That is because original Winchester vent rib 42s are very hard to find and the Simmons guns fill a collector void.
