It's possible that a large block of serial numbers that appear to be from 1954-55 were not actually used until 1957-58. In one known example a gun with serial S136431 was not shipped until June of 1958. *Note that a number of N frames with serials in the S138000-S140000 range (and the range may be wider either way) are seen that were shipped much later than the serial would suggest should be the case. I dug a little deeper in the link in the above link and this is all I found: 4 1977 Changed gas ring from yoke to cylinder 3 1967 Relocation of rear sight leaf screw
2 1961 Cylinder stop changed, hole in front of trigger 1 1959 Change to LH extractor rod thread 2 1977 Change back to gas ring on cylinder Model 13 No designation used to avoid confusion with air force model 4 1984 Change frame thickness to same as all K frames 1 1962 Change extractor rod to LH thread, eliminate 8 1977 Change to put gas ring from yoke to cylinder 7 1977 Change to put gas ring from yoke to cylinder 5 1962 Screw in front of trigger guard eliminated on 5 1962 1/10" to 1/8" front sight, on standard barrel 4 1962 Screw in front of trigger eliminated 2 1961 Changed extractor rod thread to LH on standard barrel This is about the best you'll get without somebody who has the book of serial numbers manufacture date:
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