With a family rooted in the steel mills of Pittsburgh since the late 1800s I'm familiar with a few working men and their guns. Few I knew shoot doubles - too expensive. The handful who did shoot doubles were carrying hardware store guns, probably mostly imports. A couple had Springfields which were rather highly regarded in that group. Most were in 16ga because waterfowl and turkey didn't figure in the hunting around there and the 16ga made sense for upland game (rabbits/squirrels/pheasants). Ruffed Grouse were beyond their shooting skills as they didn't practice as it was too expensive. Don't recall seeing anything with side locks - wouldn't have known the difference. Did know of one LC Smith light weight field grade 20ga which my friends father acquired from a wealthy widow in exchange for house repair work. It was a thing of special beauty to me then. Never saw a Parker, did see a couple of Ithacas in gunshops.