Thanks PinkSquirrel. From this info, indications are that pawl stops came about during the dual pawl era. Below is a closer view of my one pawl reels with no stops. While the 1400 (ringer) series would not be so clean to convert to LHW due to the ring, the 1300 series of one-pawl reels is quite simple with just two bends of the spring (one at the knee and one at the pawl). BD describes this much better in a sticky post. I've never been inclined to pound out or grind the stop on these pre-war Pfluegers to convert to LHW (I think I keep mistakenly referring to LHW as RHW in previous posts).
It looks like we are touching on attribute timelines of the prewar Medalist (pawls, spindles, spools, springs, stops, rivets, screws, foot, etc). While it may be splitting hairs or may be very difficult to know definitively, it may be a fun topic to explore the timeline and associated progression of characteristics, even though we know Pflueger were masters at utilizing left over parts and materials, creating many exceptions to the rule. Would need reels in date stamped boxes to do this. It may be the members of this forum, collectively, have enough of these to turn speculation into general consensus, or at least have fun trying. Somebody with pre-war dated box(es) would likely be best to start this type of topic.
Sandman