Partial list of changes to Smith & Wesson revolvers

S&W revolver names before World War II
      Name                              Caliber                 Frame
.22 Hand Ejector Ladysmith              22 Long                M
.22/32 Target                           22 Long Rifle          I
.22 Outdoorsman                         22 Long Rifle          K
.32 Hand Ejector (round Butt)           32 S&W Long            I
.32 Regulation Police (Square Butt)     32 S&W Long            I
.32-20 Hand Ejector                     32-20 Win.             K
.38 Military&Police                     38 Spl                 K
.38 Hand Ejector (same as above, with
adjustable sights)
.38 Regulation Police (Square Butt)     38 S&W                 I
.38 Terrier 2" Round Butt               38 S&W                 I
.38/44 Heavy Duty (fixed sights)        38 Spl                 N
.38/44 Outdoorsman (Adj. Sights)        38 Spl                 N
.357 Magnum                             357 Mag                N
.44 HAnd Ejector Military Model         44 Spl                 N
.44 Hand ejector Model 1926             44 Spl                 N
(shrouded extractor rod)
.45 U.S. Army Revolver, Model 1917      45 ACP                  N
.455 Hand ejector British Service       455 Mark II             N

        Letter designations assigned S&W Revolvers 1900-1930
32 Double Action                R
32 Safety Hammerless            G
38 Single Action                S
38 Double Action                D
38 Safety Hammerless            Y
44 Double Action                L
22 Hand Ejector                 M
32 Hand ejector                 I
38 Military and Police          K
44 Hand Ejector                 N
38 Double Action Perfect        P
22 Perfect Single Shot          T
35 Automatic                    A
32 Regulation Police            B
38 Regulation Police            E
22/32 Heavy Frame Target        V

   Factory Model/caliber designation begun in 1930s
22/32 Tarket                    IT22 Square Butt
22/32 Kit Gun                   IT22 Round Butt
K-22 Masterpiece                KT22
32 Hand Ejector                 I32 Round Butt
32 Regulation Police            I32 Square Butt
K-32 Masterpiece                KT32
38 Regulation Police            I38 Square Butt
38 S&W Terrier                  I32 Round Butt
38 Military & Police            K38
38/44 Heavy Duty                N38
K-38 Masterpiece                KT38
38/44 Outdoorsman               NT38
357 Magnum                      NT357
1926 Model 44 Military          N44
1926 Model 44 Target            NT44
1917 Army                       N45



                        S&W Model Listing
Model   year    year    Frame   Caliber         Name
        intro   Discon  Size
10      1899            K       38 Spl          Military & Police
10 HB   1960            K       38 Spl          Military & Police Heavy Barrel
11      1936    1965    K       38 S&W          Military & Police
12      1953    1986    KA      38 Spl          Military & Police Airweight
13      1974            K       357 Mag         357 Magnum M&P
14      1947    1982    KT      38 Spl          K-38 Masterpiece
15      1949            KT      38 Spl          K-38 Combat Masterpiece
16      1947    1973    KT      32 S&W Long     K-32 Masterpiece
17      1946            KT      22 LR           K-22 Masterpiece
18      1949    1986    KT      22 LR           K-22 Combat Masterpiece
19      1955            KT      357 Mag         357 Combat Magnum
20      1930    1966    N       38 Spl          38/44 Heavy Duty
21      1908    1966    N       44 Spl          1950 Model 44 Military
22      1917    1966    N       45 ACP          1950 Model 45 Army
23      1931    1966    NT      38 Spl          38/44 Outdoorsman
24      1908    1966    NT      44 Spl          1950 Model 44 Target
24      1984    1984    NT      44 Spl          7500 units reintroduced
25      1955    1983    NT      45 ACP          1955 Model 45 Target
25-3    1977    1977    NT      45 Colt         125th Commemorative
25-4    1977    1977    NT      45 Colt         125th Delux Comm
25-5    1978            NT      45 Colt         45 Colt
26      1950    1966    NT      45 ACP          1950 45 Target Light Barrel
27      1935            NT      357 Mag         357 Magnum
28      1954    1986    NT      357 Mag         357 Highway Patrolman
29      1955            NT      44 Mag          44 Magnum
30      1896    1976    I&J     32 S&W Long     32 Hand Ejector
31      1917            I&J     32 S&W Long     32 Regulation Police
32      1936    1974    I&J     38 S&W          38 Terrier
33      1917    1974    I&J     38 S&W          38 Regulation Police
34      1936            I&J     22 LR           22/32 Kit Gun 4" barrel
35      1911    1973    I&J     22 LR           22/32 Target 6" Barrel
36      1950            J       38 Spl          38 Chief Special
37      1952            JA      38 Spl          38 Chief Special Airweight
38      1955            JAC     38 Spl          Bodyguard
39      1954    1981    Auto    9mm             9mm Double Action
                        both alloy and steel
39-1    1960    1960    Auto    38 AMU          Commonly called M-52A
                        alloy
40      1952    1974    JS      38 Spl          Centennial
41      1952            Auto    22 LR           22 Semi-Automatic
41-1    1960    1972    Auto    22 short        22 Short Semi-Auto
42      1953    1974    JAT     38 Spl          Centennial Airweight
43      1954    1974    JAT     22 LR           22/32 Kit Gun Airweight
44      1954    1959    Auto    9mm             9mm Semi, Single Action
                        alloy
45      1936    1965    K       22 LR           22 Military & Police
46      1959    1968    Auto    22 LR           22 Semi Auto
47      Experimental number used on several guns
48      1959    1986    KTM     22 WMRF         K-22 Masterpiece MRF
49      1959            JC      38 Spl          Bodyguard Steel Frame
50      1955    1975    JT      38 Spl          38 Chief Special Target
51      1960    1974    JTM     22 WMRF         22/32 MRF Kit Gun
52      1961            Auto    38 Spl          38 Chief Special Target
                        Steel
52-A    See Model 39-1
53      1961    1974    KTC     22 Jet          22 center fire magnum
54      Experimental never issued
55      Experimental never issued
56      1962    1963    KT      38 Spl          KTX 38 Became Mod 15 2" bl.
57      1964            NT      41 Mag          41 Magnum
58      1964    1978    N       41 Mag          41 Magnum Military& Police
59      1971    1981    Auto    9mm             14 shot 9mm Semi-Auto
                        Alloy
60      1965            J       38 Spl          38 Chief Special Stainless
61      1970    1973    Auto    22 LR           22 Escort
62      Experimental never issued
63      1977            JT      22 LR           1977 22/32 Kit Gun Stainless
64      1970            K       38 Spl          38 Military&Police Stainless
65      1974            K       357 Mag         357 Mag M&P Stainless
66      1971            KT      357 Mag         357 Combat Mag Stainless
67      1972            KT      38 Spl          38 Combat Masterpiece Stainless
68      1976    1976    KT      38 Spl          California Highway Patrol
                                                Model Stainless
69/75   Not officially assigned -- used experimentally
76      1968    1974    Auto    9mm             Machine Pistol
77      1970    1978            22 cal          Air rifle
78      1971    1978            22 Cal          CO2 Pellet Pistol
79      1971    1978            177 Cal         CO2 Pellet Pistol
80      1975    1978            177 BB          CO2 Semi Auto Rifle



New Model Numbering System
--------------------------
147-A   1979    1979    9mm     14 shot DA steel frame Model 59
325PD	2003		N	6 shot 45 ACP, 2.5" barrel, Scandium Frame
329PD	2003		N	6 shot 44 Magnum, Scandium Frame, Stainless Brl, Ti Cylinder
340			J	5 shot 357 Magnum, Scandium Frame, shrouded/internal hammer
396			L	5 shot 44 Special, 3-1/8" barrel, Aluminum alloy frame
439     1979            9mm     8 shot DA Semi Auto Alloy
459     1979            9mm     14 shot DA Semi Auto Alloy
469     1983            9mm     12 Shot DA Semi Auto Alloy
500	2003		X	5 shot 500 S&W Magnum
520     1980    1980    N       357 Mag, Fixed Sights
539     1980    1983    9mm     8 shot DA semi auto Carbon Steel
547     1980    1985    K Steel 9mm Military & Police
559     1980    1983    Auto    9mm 14 shot DA Semi Auto Carbon Steel
581     1980            L       357 Mag Distinguished Service Magnum
586     1980            L       357 Mag Distinguished Combat Magnum
610			N	10 mm, 6 shot, stainless
624     1985    1986    NT      44 Spl 1985 Target Stainless
625			N	45 ACP and 45 Colt Stainless
627			N	357 Magnum, Stainless
629     1979            NT      44 Mag Stainless
629 Classic		N	44 Mag, Stainless, full underlug
639     1982            Auto    9mm 8 shot DA Semi Auto Stainless
645     1985            Auto    45ACP DA Semi Auto Stainless
649     1985            JC      38 Spl Bodyguard Stainless
650     1982            JM      22 WMRF Service Kit Gun Stainless
651     1982            JTM     22 WMRF Target Kit Gun Stainless
657			N	41 Magnum, 6 shot, Stainless
659     1982            Auto    9mm 14 shot DA semi Auto Stainless
669     1985            Auto    9mm 12 shot DA Semi Auto Stainless
681     1980            L       357 Mag Distinguished Service Mag Stainless
686     1980            L       357 Mag Distinguished Combat Mag Stainless
686+			L	357 Mag, 7 shot cylinder, Stainless
SW1911	2003			45 ACP 1911


Model and Dash numbering system
--------------------------------
Model 10
        -1      1959    Heavy Barrel
        -2      1961    Changed extractor rod thread to LH on standard barrel
        -3      1961    Same as above, for heavy barrel
        -4      1962    Screw in front of trigger eliminated
        -5      1962    1/10" to 1/8" front sight, on standard barrel
        -5      1962    Screw in front of trigger guard eliminated on
                        heavy barrel model
        -7      1977    Change to put gas ring from yoke to cylinder
        -8      1977    Change to put gas ring from yoke to cylinder
                        on heavy barrel model
Model 12        1957
        -1      1962    Change extractor rod to LH thread, eliminate
                        screw in front of trigger guard
        -2      1962    Front sight changed from 1/10" to 1/8"
        -3      1977    Gas ring on yoke to cylinder
        -4      1984    Change frame thickness to same as all K frames
Model 13        No designation used to avoid confusion with air force model
                13 air crewman
Model 13
        -1      1974    Introduced
        -2      1977    Change back to gas ring on cylinder
        -3      1982    eliminate cylinder counterbore
Model 14,15,16,17,18,48,53 (all start without dash in 1957)
        -1      1959    Change to LH extractor rod thread
        -2      1961    Cylinder stop changed, hole in front of trigger
                        guard eliminated
        -3      1967    Relocation of rear sight leaf screw
        -4      1977    Changed gas ring from yoke to cylinder
19                      All of the above changes and
        -5      1982    Eliminate cylinder counterbore

N-Frame Model Blue
------------------

Model 20,21,22,23,24,25 (except 25-5) 26,27,28,29
        -1      1960    Change to LH thread
        -2      1961    Cylinder stop changed, hole in front of trigger
                        guard eliminated
        -3      1982    Eliminate cylinder counterbore (magnums only)
        -4	2004	Thunder Ranch 44 Special, fixed sight
Model 57        1964    Introduced
        -1      1982    Eliminate cylinder counterbore
Model 629       1980    Introduced
        -1      1982    Eliminate cylinder counterbore
Model 25-5      1978    -5 means 45 Colt caliber
                        125'th anniversary model, -3 (standard) -4 (delux)
                        both of these used a shorter than standard cylinder.
        -7	1985	45 Colt, 5" barrel, unfluted cylinder
K-Frame Stainless Models
------------------------
64              1970    Introduced
        -1      1972    Heavy barrel
        -2      1977    2" standard barrel, gas ring from yoke to cylinder
        -3      1977    Same as above, for heavy barrel
65      -1      1974    introduced
        -2      1977    gas ring from yoke to cylinder
        -3      1982    Eliminate cylinder counterbore
66              1971    introduced
        -1      1977    Gas ring from yoke to cylinder
        -2      1982    Eliminate cylinder counterbore
67              1972    introduced
        -1      1977    gas ring from yoke to cylinder
39              1957    start of model numbering system
        -1,     1961    Made in 38 AMU cartridge for military 87 made.
        52-A -2 1971    Change of extractor
41              1957    start of model numbering system
        -1      1960    22 Short chambering
        (dash number not always stamped)
52              1961    introduced
        -1      1963    Single action only
        -2      1971    Changed extractor
52-A    See model 39-1
59              1971    introduced, no dash numbers used during production
61              1970    introduced in March
        -1      May '70 Add magazine safety
        -2      Sep '70 Addition of barrel nut
        -3      1971    Forged Al frame
76              1968    introduced, discontinued 1974 no dash numbers used

Small Frame Revolvers
---------------------
Model 30, 31, 32, 33, 34, 35
                1957    Start of numbering system
        -1      1961    Change from I frame to J frame
36      -1      1967    Indicates 3" heavy barrel
37, 38, 40, 42, 43, 49, 63, 649, 650, 651
                        No dash numbers ued on above numbers
60              1965    Introduced
        -1      1972    Heavy barrel variation made in 1972, not marketed
                        limited production only
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