Russ, in one of my posts above I should have said "many of them have the knobless ejector rod" rather than "most of them..." I don't actually know what the actual counts were for the two postwar knob styles.
But I have seen knobless ejector rods on 1947 M&Ps, including one from May of that year with a serial number under S900000. I suspect the with/without distinction may be a half-and-half thing among the long-action K-frames. Yes, some K-frames were still getting large knob ejector rods in early 1948 -- the earliest K-38 Masterpieces, for example. But the knobless ejector had already appeared in M&P production nearly a year earlier; there are pictures of them in threads on this forum. And the two inch M&Ps, of which many were produced in the postwar years, never had knobbed rods in the first place.
The "transitional" guns were transitional even inside this one defining feature.
