I have a pristine five-screw NT-430, #S173938, with 10-groove backstarp, shipped in July of 57. S&W shipped an unknown number of .44 Magnums with five-screw configuration and 10-groove backstraps which were serial numbered in the high S173000 to S174000 range in 1957.
I've owned two in the last 30 plus years. Although we will never know, I would hazard a guess that the number shipped was fairly low.
It would be interesting to hear how many Roy has actually lettered.
Jim
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