Is the WB30 photo from one of the wartime weeklies the green or blue un,if it is I think mortonsmotorcyclearchive have the original negatives and could copy it for you,they charge for this though.
This bike was one from the pre production batch which had the alternator electrics converted to a magdyno...The other picture I have, which also isn't all that clear, shows it in it's original form...