YY XX NNN M
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:
|MS (pre 1957)
|MS (post 1957)||100||600cc de-luxe|
|VTS||35 Sports||Villiers twin|
(not earlier M45)
|W||35||Villiers twin, post
1964 Red Panther
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.
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