JRB;
Yes indeed some of them were Monarchs. I can't recall for sure now which all brands had the flame hardened ways, but am pretty sure there were others beside the Monarchs. Workwd on a large Sidney for a time which was herringbone geard & am thinking it had the flame hardened ways as well. It was about a 24" swing & with those herringbone gears you could hardly here it run. Except for one bad feature was probably the best engine lathe I ever worked on. That feature was that when you lifted the start lever there was virtually no clutch action, it just came on at set speed all at once.
