| Norton Year Codes | Code | Year | Code | Year | Code | Year |
| Year codes were used for all models between 1946 & 1960. | A | 1946 | F | 1951 | L | 1956 |
| B | 1947 | G | 1952 | M | 1957 | |
| C | 1948 | H | 1953 | N | 1958 | |
| D | 1949 | J | 1954 | P | 1959 | |
| E | 1950 | K | 1955 | R | 1960 |
| Norton Model Codes | Code | Model | Code | Model |
|
In addition; suffix D indicates de-luxe twin, suffix SS indicates Sports Special twin, suffix Q indicates quietening ramp cams (some 1947 singles) |
2 | 16H | 122 | 88 |
| 3 | 18 | 13 | 50 | |
| 3T | 500T | 14 | 99 | |
| 4 | ES2 | 15 | 77 & Nomad | |
| 6 | 19R | 16 | Nomad | |
| 7 | Big 4 | 17 | Jubilee | |
| 8 | 16H or Big Four plunger | 18 | All 650 twins | |
| 9 | 19S | 19 | Navigator | |
| 10 | International 40 | 20 | Atlas | |
| 10M | Manx 40 | 20M3 | Commando (distributor) | |
| 10M2 | Manx 40 Featherbed | 20M3S | Commando (camshaft points) | |
| 11 | International 30 | 50 | AMC 50 | |
| 11M | Manx 30 | ES | Electra | |
| 11M2 | Manx 30 Featherbed | ES2 | AMC ES2 | |
| 12 | Model 7 |
| Norton Serial Numbers | Year | No. | Year | No. | Year | No. | |||||
|
1945 | 1001 | 1956 | 66600 | 1967 | 119760 | |||||
| 1946 | 2131 | 1957 | 71360 | 1968 | 124300 | ||||||
| 1947 | 7756 | 1958 | 77400 | 1969 | 130000 | ||||||
| 1948 | 13792 | 1959 | 80488 | 1970 | 134700 | ||||||
| 1949 | 20701 | 1960 | 87038 | 1971 | 141700 | ||||||
| 1950 | 27100 | 1961 | 94500 | 1972 | 200001 | ||||||
| 1951 | 35560 | 1962 | 101060 | 1973 | 212278 | ||||||
| 1952 | 42700 | 1963 | 105000 | 1973 | 300000 (850) | ||||||
| 1953 | 48900 | 1964 | 108000 | 1974 | 307311 | ||||||
| 1954 | 55350 | 1965 | 111650 | 1975 | 325000 (MkIII) | ||||||
| 1955 | 60700 | 1966 | 115870 | 125001 (frame) |
| The above information has been reproduced from the publications of Roy Bacon. . |
| . |
 |
| Model | Date | Number | Notes |
|---|---|---|---|
|
Atlas |
Feb 1964 | 108000 | First Atlas |
|
Atlas |
Sept 1964 | 111377 | -- |
|
Atlas |
1966 | 115871 | -- |
| Atlas | 1967 | 120323 | -- |
| Atlas | May 1967 | 121307 | N15CS |
| Atlas | May 1967 | 121307 | Concentrics Carbs & coil ignition |
| Atlas | May 1967 | 121665 | P11 |
| Atlas | Aug 1967 | 123364 | -- |
| Atlas | Jan1968 | 124372 | P11A |
| Atlas | Sept 1968 | 128646 | P11A Ranger |
| Atlas | Nov 1968 | 129145 | Last Ranger |
| Commando 750cc | 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 withcamshaft points |
| " | Sept 1969 | 134108 | First wolverhampton engines (P-suffix) |
| " | Mar 1970 | 135140 | Roadster |
| " | June 1970 | 135088 | Last S |
| " | Sept 1970 | 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 |
| " | Jan 1972 | 200001 | Roadster MK IV |
| " | Jan 1972 | 200001 | FastbackLR MK IV |
| " | Jan 1972 | 200001 | Hi-Rider MK IV |
| " | Jan 1972 | 200001 | Interstate |
|
750cc |
--- | 200976 | First Combat Engine |
| " | --- | 211110 | First Detuned |
| " | 1973 | 212278 | Interstate |
| " | Mar 1973 | 220000 | Roadster MK V |
| " | Mar 1973 | 220000 | Hi-Rider MK V |
| " | Mar 1973 | 220000 | Interstate MK V |
| " | Oct 1973 | 230935 | Last 750cc Commando |
| Commando 850 | 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 |