Woodlecj:
The 629-4 was produced from 1993 to 1997. Per the Standard Catalog of S&W MIM parts were introduced with the 629-5 in 1997, but there was a change to the cylinder release with the 629-4 in 1997, it doesn't state wether the new part was MIM.
Your gun appears to be the 629 Power Port. .44 magnum, 6.5 inch barrel, target hammer, smooth combat trigger, black patridge front sight, adjustable rearm single port comp, hogue grips on a round butt. Product code 103624, Manufactured from 1996 on.
Serial numbers in tyhe CBDxxxx range shipped in Septembeer 1996, in the CBN range in August 1997. I expect your gun fell in between those two dates.