Hobie started selling the Mirage kayak in the fall of 1997. I bought a rotomolded one built in Aug. 2000 with serial # 3xxx, so I guess they transitioned to plastic in about 1998 (?). Hobie had been rotomolding the (paddle only) Pursuit since 1996 and I suspect they started building the Mirage out of fiberglass for at least several months while waiting for an appropriate rotomold to be built and delivered. I believe fiberglass hulls were slightly smaller due to the different manufacturing process. Fiberglass hulls are fairly rare and seem to be most common in So Cal. Hobie was a small company then.
The Mirage was renamed Classic in 2001 (I think) and the term "Mirage" subsequently referred only to the Drive. The Classic was produced through the 2006 model year. It was a great little boat, lively and very efficient up to "hull speed".
According to my old catalog, Hobie also sold an "Aspire" model (identical hull) that was upgradable with a "Mirage kit". Evidently this model had a drivewell (with plug) but no Drive or rudder. I didn't see a rudder control or up/down lever in your picture so you may in fact have an Aspire. Seats in those days were fastened permanently with rivets and not easily replaced if eventually ripped or torn. If you had a Drive from that vintage it would have an aluminum spine, aluminum drums and possibly canvas "sails" (fins).