Gotcha. The curved iron seems to be common to graded guns. But when you call it "graded" iron in this context, it sort of implies it mght have been retrofitted with metal from a graded gun. However, it's quite likely it's original and correct. A brief survey I did of pics online awhile back seemed to correlate the curved iron on SW's to ejector models. Can't remember if my small sample was 100% curved, but given that ejector SW's are not common to begin with, curved irons seemed to be common on ejector SW's.
So, if I'm correct, I would have guessed that your SW's in the pics were ejector on top and extractor on bottom. Would I be right? If so, it's a way to recognize an ejector SW in profile, without seeing the escutcheon.
Your correct on the two I posted earlier. However, here's a picture of my Fox SW ejector 12 gauge made in 1919 that I utilized to make the custom Fox:
