Richard,
The 990 derailleur is pictured on pages 18 and 24 of Campagnolo catalogue n.18 bis which is dated 12-86.
I had a 980 which was almost identical to the 990; (I sold it on eBay.) The 980 derailleur was part of the the "equipaggiamento" (equipment) group (as per Campagnolo catalogue n.18 dated 12/85.)
There's your timeline answer; perhaps another list member can inform us as to what "teir" these derailleurs fall into............. If I had to guess, I would say they are inexpensive, lightweight, utility/replacement derailleurs.
Ted Baer Palo Alto, CA
--- "richardsachs@juno.com" <richardsachs@juno.com>
wrote:
>
> in case you thought i wasn't serious, i'll ask
> again...
> i have campagolo 990 derailleurs nib. does anyone
> know where these fit into the timeline or quality
> teir?
> e-RICHIE
> aka Richard M Sachs
> Chester, CT
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