I own a S&W Model 30-1, Serial No. 785XXX, with a 4" barrel, adjustable sights, and the most beautiful blued finish I've seen on a J-frame. The caliber is .32 S&W Long. The frame is a round butt, and the grips, which I'm not sure are original to the gun, are diamond magnas. While I have fairly large hands and have trouble with the small-frame magnas, my lady friend can shoot this little beauty with amazing accuracy.