YY XX NNN M
Where
YY is the year of manufacture. Generally just add 1900! My 1949 M75 starts with just a 9 so there is some variation but not sufficient to produce real ambiguity
XX is the alphabetic model code as follows:
| Code | Model | Details |
| A | 80 | 500cc |
| D | 70 | 350cc |
| GS | 50 | |
| H | 60 | 250cc |
| J | 65 | 250cc |
| K | 75 | 350cc |
| M | 100 | 600cc rigid |
| MS (pre 1957)
MSN |
100 | 600cc swing-arm,
half-width hubs |
| MS (post 1957) | 100 | 600cc de-luxe |
| V | 10/3
10/4 |
197cc Villiers |
| VA | 10/3A | 197cc Villiers |
| VT | 35 | Villiers twin |
| VTS | 35 Sports | Villiers twin |
| VTT | 45 | 325cc Villiers
(not earlier M45) |
| W | 35 | Villiers twin, post
1964 Red Panther |
| X | Stroud | |
| ZA | 120 | 650cc |
M is the alphabetic modification code. This indicated within a given production year the revision or modification number. I believe that these start at A.
As an example 56K065A is a Model 75 manufactured in 1956 to the original (unmodified) 1956 specifications and was the 65th engine (batch of engines?) made that year.
Other codes, such as assemblers codes sometimes appear.
Disclaimer All data are provided in good faith. Neither I nor the originator of the data accept any liability for problems arising from using this information. It is your responsibility to ensure that the advice is sound. If your local laws do not allow this disclaimer then you are not permitted to read this section.
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