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 77 (Rigid twin) & Model 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    300200(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   ?              1977    335400 (850)
1944   ?              last 850    336538
Note: Earliest surviving factory records are for 23 November 1922 when #4200 was produced.
NOC Number from Norton Owners Club records; Number column values sourced from various publications including
  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

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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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