Also, you can obtain the revised edition of Jinks & Neal book Smith & Wesson 1857 - 1945. It does not cover the post-war Masterpiece line, but details quite well the K22 1st & 2nd Model Outdoorsman's revolver.

Information above is a very good start and my only comment is that the 2nd Model Outdoorsman's 2nd Model did have a micrometer rear sight. It is a very uncommon model made from 1940 to 1942. It also had the first K frame Magna stocks made. I think there were just about 1000 made before production stopped with the advent of WWII. The Masterpiece line replaced the Outdoorsman's after WWII.

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Gary
SWCA 2515