unusual little water cooled jap

hi all,
i bought this little jap last week via eBay because i thought it was a little unusual but now iv got it home for a proper look and started doing a bit of research i cant find any thing like it. id like to try and get some pictures of a complete one so i can at least try and put it back into running order.

All the pictures and details are here on my website 

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(if not allowed admin please advise)

any help would be much appreciated, especially with the magneto/governor assembly 

thanks in advance,
Liam