Bsa anno di costruzione

[spirlib]

Good evening, I have owned an M20 for years and would like to finish a restoration that began years ago and then suspended, I would like to know after I can find precise information. the chassis number is preceded by the acronym WM n 79987. It should be a military motorcycle. Thanks for the answers.

[Greenfield]

Engine and frame numbers WM20 70000 onwards were produced in 1942 .