I think that this is the earliest document that I have that shows a Vivo derailleur - and my guess is that it dates from 1996. The Derailleur is referred to as a 'Vivo Enduro Seal'. The words 'Enduro Seal' are also shown painted on pulley cage in two of the photos (but not in a third). I have never actually seen an example in this 'Enduro Seal' livery, and I think this may be a pre-production prototype.
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Vivo Enduro 1996?