Muley Gil is absolutely correct - those are definitely postwar.
My question: are we sure they are N frame?
Also, maybe my eyesight isn't so good, but are the shoulders sharp? I don't see much taper. That would put them in the early 1950s at the latest. The problem is the serial number would not fit a C prefix K frame in the period of the sharp shoulders, since those went away in late '52 or early '53. You end up with the same problem you face with the N frames.
So maybe the shoulder is tapered after all.
