For the 3" or 4" prints that were common back in the day, nearly any of the really simple cameras (meniscus lens, fixed aperture and shutter) were perfectly adequate. Midday, clear, sun over your shoulder, on ISO 100, subject at 6-10 feet, hold steady, and you'd get good results almost every time. Limitations like that are part of what makes photography.
I've got an Ansco Shur-Shot Jr. that does fine for contact prints or up to 4" enlargements, and my Brownie Hawkeye Flash cameras (got two) do as well.