Thanks you very much,

Ian, what years would those two colours be used?

The bike is a 1946 xb31

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These colours were used pre and post war on Navy vehicles...They were never a standard BSA colour on the XB31 which was black and silver....

I have no idea whether the B31 was used by the Navy post war, I've seen nothing to indicate that to date...Ian

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

Could it be a wartime chaincase from a cancelled BSA B30 contract? Didn't the RN receive a few of these ?

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Everything newly built after the commencement of the war was finished in drab paint ....Ian

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

Thank you Ian.

email (option): unpob@yahoo.com