Hi,
I have one as well and have not had much luck trying to find out info on line. here is a site I found:
But I am assuming you found this yourself in your search. I did e-mail the gentleman and he responded but did not have much to add other than this page. I have tried the vintage Omega search froom Omega but never heard back...twice over the last year. If you have any other luck I would appreciate you sharing the info.
Thanks, TR