This review of a, somewhat utilitarian, Atala Super Sprint bicycle features an Ofmega Mistral derailleur. I never really expected the Mistral to be fitted to a 'shopping bike', but here it is. The images are not especially clear, but you can tell that the derailleur has the following attributes:
If you check out the various versions of the Ofmega Mistral on this web site, you may agree that these features make it a very late version.
Browse associated derailleurs.