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Engineering and production changes:
• Before 1957, produced as the NT-430 .44 Magnum.
- 1957 Th e NT-430 .44 Magnum is continued as the Model 29.

• 29 1957 Stamping of model number at approximate serial S179000.
- 1958 8-3/8” barrel introduced, 500 5” barrels manufactured.

• 1960 10 Model 29s Manufactured with 5-1/2” barrel for H.H. Harris w/blue finish.

• 29-1 1962 Change extractor rod; thread changed to left hand to prevent unscrewing under recoil at approximately serial S220000- most are 3 screw frames 2 known with 4-screw frames. - Note that most -1 production is found as a 3 screw frame.

• 29-2 1962 Improved cylinder stop implemented, eliminate trigger guard screw.
- 1968 Delete diamond around screw escutcheon on grip.
- 1969 Change to N serial prefix at serial S333454. - 1979 6-1/2” barrel length dropped in favor of 6” as standard barrel length.

• 29-3 1982 Eliminate cylinder counterbore and pinned barrel with small change in cylinder length to 1.69”.
- 1983 N serial prefix ends and starts 3 letter serial prefix.
- Introduction of the Silhouette in 10-5/8” barrel length.

• 29-3E 1987 Endurance Package-early markings of the -4.

• 29-4 1988 New yoke retention system /radius stud package/ floating hand early models marked 29-3E for endurance package.
- 1990 Longer stop notch in cylinder, new bolt block.
- Introduction of the Magna Classic.
- 1991 Introduction of the .44 Classic.
- 1992 Introduction of the .44 Magnum Classic Deluxe.

• 29-6 1993 Hogue grips, drill and tap frame top strap, change rear sight leaf, change extractor.
- 1995-96 Delete square butt Features, Change to MIM thumbpiece, begin shipments in blue plastic case.
- 1996 S&W Collectors Assn. 25th Anniversary Edition.
- 1997 Ship with Master trigger locks; change to MIM triggers.

• 29-7 Note: Th e Model 29-7 is probably the rarest –dash variation other than the Model 29-1.
- 1998 Change in frame design about August 1998– eliminate pressed in cylinder stop stud, eliminate serrated tangs /change to MIM hammer and frame mounted floating firing pin / change internal lockworks, production of this engineering change is very low. Some reported blue w/ stainless cylinder; some all blue.
- 1999 Model 29 is officially discontinued Jan 99, with a small production run made in 2000, shipped with stainless cylinders. Special production runs only.

• 29-8 2001 New frame design with Internal lock system and fired case, 4-screw sideplate, 150th Year Commemorative of S&W manufactured and production overruns.

• 29-9 2002 Performance Center variations in blue and nickel with 4-screw sideplate. Part of the Heritage Series.

• 29-10 2006 50th Anniversary Edition, first fifty are class A engraved w/serrated backstrap, 4-screw sideplate and square butt frame.

• 29-10 2006 Blue and nickel specials with square butt four screw frame, serrated tangs, internal lock, wood display case. Screwdriver, bore brush, swab and handle.

(SCSW 4th, Page 233).
 
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