Bob, there have been functional and cosmetic upgrades to the Unique Cobras over time and the major one is visually identifiable by wider SC-style lips on the rear wheel openings. My older Unique has a more narrow-hipped fender style (which I happen to love). I'm not certain of the chronology, but I think that one occurred before 1996.
You've probably already been there, but here's the manufacturer's website:
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Unique owners' forum - not as busy and active as this site, but you can find help from the manufacturer as well as owner/drivers:
Unique Forums