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BSA M20 Engine Number

Anyone familiar with this number? It reads B12MS5.

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Re: BSA M20 Engine Number

This is a "rebuild code", but I bet there is another number behind the "5"... The B code is a T.T.3 workshop number, and the number behind the MS abbreviation (Ministry of Supply) is the month and year: e.g. 24 = February 1944 etc.


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Re: BSA M20 Engine Number

Thanks for the reply.

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