Shade, what you mean is that 700,000+ were made up to 1942. That is when they hit 999,999 and rolled over to V1. (God, wouldn't it be cool to find that - probably in a museum or somewhere, they usually gave those away as honoraria or kept them in the vault). His gun, if it is does not have a V or C prefix, will date to the mid/early 20's I think. If so, it should have a 1/2 moon front sight, single line address on the r. frame (e.g., "Made in USA" as opposed to blank or the later four line address), and a mushroom head ejector (deleted in 1930 I think). Heat treating started at S/N 316xxx, and I have it on good sources that was in 1921 (could be wrong). So his should be shortly after that. It's after 1929 and until 1940 that all S/N's get screwy, because the depression played hell on production/shipping/sales dates. Shande, since you like doing this so much, there's another source for dates. It was posted at the S&W forum by SaxonPig last fall, and he put it in the sticky at the top of this forum about "common S&W identifying features" a month or so ago. It is mostly good only for post-war K and N frames and pre-alpha/numeric sequence, but is more accurate than the SCSW 2nd appendix.