Mike...Again, no answer, only that S&W did continue to number the extractor.
Bill
You know they are assembly (factory work) #s because of those 3* locations that always match on guns that are original, and that’s the only usefulness for them after guns leave the factory: still used to this day, long after serial number locations decreased..
I have a model 29-2 serial # S2315xx dating to 1962-63 that has serial on cylinder, extractor and frame but not barrel. No diamonds or other markings as discribed here to indicate a repair or refinish.
Why did the new shaped stars replace the old symmetrical stars and were no longer stamped with a Sn.? Fair inquiry. Best, Mike 2796