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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