There were three iterations of the K-22 Outdoorsman which then became the Model 17
K-22 Outdoorsman (second model) 1931-1940, serial numbers 632123-682419
Model K-22 Masterpiece (second model) 1940-41 serial numbers 682420-696952
Model K-22 Masterpiece (third model, “pre Model 17) 1946-57
The pre Model 17 became the Model 17 K-22 Masterpiece in 1957 when S&W started using model numbers and continued in production until 1989.
The Pre Model 18 was a pre Model 17 with a 4” rather than 6” barrel and was introduced in 1949 and was produced until 1986 when it was replaced by a heavy barrel 4” Model 17.
Beginning in 1946 S&W started using a “K” prefix in its K frame revolvers. In 1970 they reached K999999 and changed the format adding a number in front of and behind the “K”
1959 serial numbers included K350548 through K386804, which makes yours a Model 17 and dates to 1959. If you open the crane and look on the frame you’ll see some assembly numbers and “Mod 17” or “Mod 17-1”.
1959 is the year S&W introduced the Model 17-1 which changed the ejector rod from a right hand to a left hand thread, and they are considered to be scarce.
The 17-2 came out in 1961, which is when they delete the trigger guard screw making subsequent revolvers “three screw” rather than “four screw” revolvers. The 17-2 also had a different cylinder stop.
The 17-3 came out in 1967 and had a relocated rear sight screw.
S&W deleted the Diamond grips in 1968.
The 17-4 was introduced in 1977 and moved the gas ring from the yoke to the cylinder.
In 1982 S&W stopped using the pinned barrel.
The 17-5 as first produced in 1988 with a new yoke retention/radius stud package.
In 1989, the Model 17 was discontinued and replaced with the Model 17-6 with a full under lug barrel and a new toke retention system in 1990. There are some early transitional 17-6s without the full under lug.
The 17-7 was introduced in 1994 with a drilled and tape frame, a different rear sight leaf and ejector.
The 10 shot alloy cylinder 17-8 entered production in 1996
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Below are my 3rd model K-22 Outdoorsman and my 17-3 with target hammer, target trigger and target grips. The most noticeable difference other than the grips is the slight taper in the Outdoorsman barrel.