Per "Standard Catalog of S&W; 3rd Edition"
Prior to 1957 produced as the Combat Magnum
1957-M19 Stamping of model number
1959-M19-1 Change extractor rod, right hand to left hand thread
1961-M19-2 Cylinder stop changed. Delete trigger guard screw
1967-M19-3 Relocation of rear sight leaf screw
1977-M19-4 Gas ring moved from yoke to cylinder
1982-M19-5 Eliminate cylinder counterbore and pinned barrel. Cylinder length shortened to 1.62"
1988-M19-6 New yoke retention system/radius stud package/floating hand/hammer nose bushing
1994-M19-7 Change to synthetic grips, drill and tap framechange extractor, change rear sight leaf
1998-M19-8 Change in frame design: cylinder stop stud eliminated/eliminated serrated tang/change to MIM hammer with floating firing pin/change internal lockwork
1999 model discontinued
IME: -3, -4, & -5 seem to be the most commonly encountered.
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Formerly know as Lucky Derby
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