Welcome to the Forum! We'll need pictures and/or more information to help you with this mystery. The Model 29-2 .44 Magnum revolver was manufactured only from 1962 to 1982 (when the 29-3 was introduced), and would have had either an S- or N-prefix serial number. The 29-2s have a pinned barrel and recessed cylinder holes. As 22hipower informed you, the "AHPxxxx" s/n that you reported was for 1985, and would not in any way relate to a Model 29-2. Even 29-3s and some 29-4s had N-prefix s/ns. You will need to double check your model number and s/n (inside the yoke and on the bottom of the grip frame), and the caliber (right side of the barrel). To the best of my knowledge, S&W stopped making some nickel revolvers around 1986. However, there are some Product Codes (e.g. 101210, 101212, 101214) that pertain to 4", 6", and 8-3/8" bbl. Model 29s from 1984-1991. I do not know which variation of Model 29s those were (-3, -4?).