Classic and Classy Motorcycles Ltd

Pre-war Models Engine Serial Numbers (1923-1939)
Engine Serial Number Range by Year:
1923: 4200 to 7550
1924: 7550 to 11900
1925: 11900 to 27500
1926: 27500 to 32800
1927: 32800 to 36900
1928: 36900 to 41000
1929: 41000 to 45600
1930: 45600 to 49250
1931: 49250 to 51820
1932: 51820 to 54120
1933: 54120 to 56140
1934: 56120 to 59500
1935: 59500 to 62800
1936: 62800 to 69800
1937: 69800 to 81500
1938: 81500 to 87920
1939: 87920 to 94700

Norton Serial Numbers Overview (1945-1975)
Yearly Serial Numbers:
1945: 1001
1946: 2131
1947: 7756
1948: 13792
1949: 35560
1950: 42700
1951: 48900
1952: 55350
1953: 60700
1954: 66600
1955: 71360
1956: 77400
1959: 80488
1960: 87038
1961: 94500
1962: 101060
1963: 105000

Year Letter Code Table
A = 1946, B = 1947, C = 1948, D = 1949, E = 1950, F = 1951, G = 1952, H = 1953, J = 1954, K = 1955, L = 1956, M = 1957, N = 1958, P = 1959, R = 1960

Atlas Series:
Feb 1964: 108000 (First Atlas)
Sept 1964: 111377
1966: 115871
1967:
May: 121307 (N15CS)
May: 121307 (Concentrics Carbs & coil ignition)
May: 121665 (P11)
Aug: 123364
Jan 1968: 124372 (P11A)
Sept 1968: 128646 (P11A Ranger)
Nov 1968: 129145 (Last Ranger)

Commando 750cc Series:
Aug 1967: 123666 (First Model)
Feb 1968: 126125 (First Production Machine)
Mar 1969: 131180 (Fastback)
Mar 1969: 131257 (S with Camshaft Points)
Sept 1969: 133668 (Fastback with camshaft points)
Sept 1969: 134108 (First Wolverhampton engines, P-suffix)
Mar 1970: 135140 (Roadster)
June 1970: 135088 (Last S)
Sept 1970: 139571 (Fastback MK II)
Jan 1971: 141717 (Last Fastback MK II)
Jan 1971: 141783 (Fastback MK III)
Jan 1971: 142583 (Roadster MK II)
Mar 1971: 145234 (SS)
Apr 1971: 144343 (Fastback LR)
May 1971: 146074 (Hi-Rider)
Oct 1971: 150723 (Last SS)
Jan 1972: 200001 (Fastback MK IV, Roadster MK IV, FastbackLR MK IV, Hi-Rider MK IV, Interstate)

750cc Series:
1973: 212278 (Interstate)
Mar 1973: 220000 (Roadster MK V, Hi-Rider MK V, Interstate MK V)
Oct 1973: 230935 (Last 750cc Commando)

Commando 850 Series:
Apr 1973: 300000 (First 850)
Sept 1973: 306591 (MK IA 850)
Jan 1974: 307311 (Mk II and IIA 850)
Feb 1975: F12001 (Frame number MK III)

Model Code Translator:
- 2 = 16H
- 3 = 18
- 3T = 500T
- 4 = ES2
- 6 = 19R
- 7 = Big 4
- 8 = 16H or Big Four Plunger
- 9 = 19S
- 10 = International 40
- 10M = Manx 40
- 10M2 = Manx 40 Featherbed
- 11 = International 30
- 11M = Manx 30
- 11M2 = Manx 30 Featherbed
- 12 = Model 7
- 13 = 50
- 14 = 99
- 15 = 77 & Nomad
- 16 = Nomad
- 17 = Jubilee
- 18 = All 650 twins
- 19 = Navigator
- 20 = Atlas
- 20M3 = Commando (distributor)
- 20M3S = Commando (Camshaft points)
- 50 = AMC 50
- ES = Electra
- ES2 = AMC ES2

Notes For Translating Model Letters:
Suffix 'D' indicates deluxe twin
Suffix 'SS' indicates Sports Special Twins
Suffix 'Q' indicates quieting ramp cams (some 1947 singles)


Source: http://classicenglishbikes.com