Norton model identification with engine and frame numbers

A simple guide to identifying the year of manufacture of a Norton from the engine and frame numbers. "From 1945 to 1974 these numbers should match , and up to 1960 should include a year letter code.   There will also be a number code for the model and the serial number which ran from 10001 too over 300 000 over the years.
Sources:

  1. "Illustrated Norton Buyer's Guide", Bacon, Roy H. (Roy Hunt), Niton Publishing. PO Box 3, Ventnor, Isle of Wight PO 38 2As England, 1991. [Out of print in Australia 1999].
  2. Norton Owner's Club NOC

Post war models

Model Codes

Code Model Code Model Code Model
2 16H 10M2 Manx 40 featherbed  17 Jubilee
3 18 11 International 30 18 all 650 twins
3T 500T 11M Manx 30 19 Navigator
4 ES2 11M2 Manx 30 featherbed 20 Atlas
6 19R 12 Model 7 20M3 Commando (distributor)
7 Big 4 122 88 29M3S Commando (camshaft points
8 16H or Big 4 plunger 13 50 50 AMC 50
9 19S 14 99 ES Electra
10 International 40 15 77 & Nomad ES2 AMC  ES2
10M Manx 40 16 Nomad    
  Suffix D indicates de luxe twin
  Suffix SS indicates Sports Special  twin
  Suffix Q indicates quietening ramp cams ( some 1947 singles)

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Norton engine & frame numbers

Pre-war numbers   Post-war with serial numbers    Post-war numbers continued
Year Number   NOC Number      YEAR Code Letter  Number   NOC Number   Year  Number   NOC Number
1923     4200    1945     1001      1961    94500   99270
1924     7500    1946  A   2131   1001    1962  101060   99498
1925   11900    1947  B   7756   6550    1963  105000 104000
1926   27500    1948  C 13792 13350    1964  108000 108000
1927   32800    1949  D 20701 18600    1965  111650 111650
1928   36900    1950  E 27100 25000    1966  115870 115900
1929   41000    1951  F 35560 33943    1967  119760 120130
1930   45600    1952  G 42700 40320    1968  124300 124370
1931   49250    1953  H 48900 47300    1969  130000 129500
1932   51820    1954  J  55350 52800    1970  134700 134400
1933   54120    1955  K 60700 59200    1971  141700 141000 to 150500
1934   56410    1956  L 66600 64561    1972  200001  200001 to 216000
1935   59500    1957  M 71360 70095    1973 Jun    230558 (750)
1936   62800    1958  N 77400 75051    1973 Sep  212278  230571 (750)
1937   69800    1959  P 80488 79301     last 750    230935
1938   81500    1960  R 87038 84500   1973 Mar    325000 (850)
1939   87920              1973 Dec  300000 (850)  310360 (850)
1940   ?              1974 Jun    316600 (850)
1941   ?              1974 Dec  307311  326000 (850)
1942   ?              1975 Jun  325000 (MkIII) 125001 (frame)  333000 (850)
1943   ?                  
1944   ?                  
Note: Earliest surviving factory records are for 23 November 1922 when #4200 was produced.

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Model numbers for 1920s

Source: http://www.realclassic.co.uk/

Code

Model

1 Big 4 633cc, 3 speed Sturmey Archer gearbox 
2 490cc, 3 speed Sturmey Archer gearbox 
3 Big 4, 633cc, 3 speed Sturmey Archer gearbox, secondary belt drive 
4 490cc, 3 speed Sturmey Archer gearbox, secondary belt drive 
5 Big 4, 633cc, 3 speed hub, secondary belt drive 
6 490cc, 3 speed hub, secondary belt drive 
7 Brooklands Special (B.S.), 490cc, direct drive with Phillipson pulley (optional) 
8 Brookland Road Special (B.R.S.), 490cc, direct drive with Phillipson pulley (optional) 
9 Tourist Trophy (T.T.), 490cc, direct drive or Phillipson pulley (optional) 
10 Touring machine, direct belt drive 
11 Big 4 633cc, direct belt drive touring machine 
12 490cc, colonial model, 3 speed hub, belt drive 
13 Big 4 633cc, colonial model, 3 speed hub, belt drive 
14 Big 4 633cc, 4 speed, all chain drive 
15 Big 4 633cc, 3 speed, De Luxe sidecar outfit 
16H 490cc, 3 speed, chain drive, touring model 
17 490cc, 3 speed, chain drive, touring colonial model 
18 OHV 490cc, 3 speed, chain drive
19 OHV 588cc, 3 speed, chain drive
20 490cc, twin port exhausts, 3 speed
21 OHV 490cc, dry sump, 3 speed
24 OHV 588cc, 4 speed
25 OHV TT replica, dry sump, 3 speed
24 OHV 490cc,4 speed
44 OHV 588cc,4 speed

Sources: "Flat Tank Norton", George Cohen, 2006:ISBN 978-0-9553743-0-2 (www.norton.uk.com)
Big 4 article at http://www.realclassic.co.uk/norton04030400.html
Various Norton sales brochures

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How to pick the Year's Models

Post 1926 Best & Lloyd oil pump
1926 Eng. No. 13279 / 28146
1927 Flat tank, valve adjusters on tappets. Eng. No. 28141 / 35775
1928 Flat tank, valve adjusters on the overhead rockers. Eng. No. 35511 / 40515
1929 Long saddle tank. Eng. No. 41692 / 45599
1930 Enclosed push-rods and rockers. Eng. No. 45600 / 49000
1931 New design short saddle tank. Eng. No. 49001 / 51800
1932 Detachable wheels with bolts exposed, hand adjustable from fork shock absorber. Eng. No. 51801 / 54120
1933 Detachable wheels with bolts enclosed in hub shell. Eng. No. 54121 / 56400
1934 Rebound spring on front forks. Eng. No. 56401 / 59500
1935 Rubber-mounted handlebars. Eng. No. 59501 / 62800
1936 Shorter and thicker push-rod tubes and rounded timing case cover. Eng. No. 62801 / 69999
  Model 18: Push-rod engine; Diamond frame; bore and stroke, 79 x 100.
  Model 19: Push-rod engine; Diamond frame; bore and stroke, 92 x 113, or 79 x 100.
  Model ES2: Push-rod engine; cradle frame; bore and stroke, 79 x 100.
1937 Eng. No. 70000 / 79999
1938 Model 18: Eng. No. 81575 / 87705
  Model 19: Eng. No. 82119 / 87726
  Model ES2: Eng. No. 81557 / 87757

Source: Motorcycle Identification Manual (with Australian Values) Models 1927 - 1938
Additional information from sales brochures and manuals

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