The "Simmons Patented" marking, at least on Model 42s, is just an earlier marking than the "Simmons Gun Specialties, Kansas City, Missouri" marking. I don't remember the dates specifically. In the later period of Model 42 manufacture, a few Winchester marketed Model 42s were made with oval posts and no Simmons markings at all. This is just another variation of Simmons installed ribs on original Winchester marketed guns. Popular opinion is that all Model 12 vent rib guns marketed by Winchester had ribs installed at Winchester. That same opinion is that only the donut post Model 42 rib with squiggly lines were installed at Winchester. I would be interested to know Jimmy's reference stating that some Winchester marketed vent rib Model 12s had their ribs installed at Simmons. I am not familiar with that reference.
