You have a late model dash 2 made just before S&W came out with the dash 3. I have one just like it which I used in USPSA competition for over 20 years. I retired it a few years ago when I discovered the chronoed velocity from my 5" dash-2 was lower than I was getting from a 625 with a 4" bbl. I believe the bore wore just enough to lower the velocity. I didn't want to add more powder so I retired it.

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Bob.
SWCA 1821