And a last one: two post war registered BSAs with "close (YD) numbers":

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Is it possible that there is evidence of two rebuilds in this case, the frame number ends "55" which I had wondered could be 1955, but the brass rebuild plate stamped 1952 would seem to disprove this, however the rebuild serial "C1422451" predates the change from the tank mounted serial to the later "64YD66" registration, could that have been as late as 1952?

There is wartime literature which states that all "B" vehicles should be rebuilt after 3 years and a new census number issued (motorcycles starting C14...), but we know this didn't always happen.

Plus some of the "frame" numbers in the post war key cards are almost definitly taken from the engine just to muddy the waters further.

Certainly an interesting machine.

Rob

email (option): robmiller11@yahoo.co.uk

Another clue... The oval stamp on Piers' engine looks like a "JLO" stamp (as in the second picture), which would mean that the engine was rebuilt in the JLO factory "shortly" after the war. Can you confirm that it is a JLO stamp Piers?

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Below is one of a series of photos taken at the JLO factory....Shelves full of M20 engines!....Ian

email (option): ian@wright52.plus.com

Piers has sent me a slightly better picture of the JLO logo (or at least that's what I thought it was):



There is no doubt about it anymore, this is a double (or even triple) stamped JLO logo, meaning that the engine was rebuilt in No. 10 REME Auxiliary Workshop JLO Factory Hamburg. (Thanks for the wonderful pictures Lex).

But if you watch closely you will discover another marking as well: a half circle with either A6 or 9V, depending on the way you look at it. Is it a faintly stamped full circle? No it isn't. I've seen another one combined with a JLO stamp:



So could it be a JLO inspector's marking...? Maybe, but there's no JLO stamp in this picture:



These are the only pictures that I have with this half circle stamp. So not sure (yet) what it is...

And finally, there's also a single B stamp on Piers' engine and in the picture above. We've discussed these B and BB stamps in this thread.

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