If it's holding air, no need to replace it for now. You can get replacement seals at the enduro seal site, which I linky'd b4... if it's leaking oil.
If you do end up replacing the fork, you'll need to find one with a 1" steerer tube, not the 1 1/8" which is the norm these days. Marzocchi (& Pace, in the UK) are the only ones making 'em anymore.
What size is the frame? if it's ~19" I might be interested if you want to 'upgrade' down the road. I had a '96 M2 stumpy, which I loved the handling of, but sold to finance a full suspension rig, since the aluminum stumpy was too harsh on long rides... and I was getting the itch to 'upgrade' to another bike.
Oh yeah, special'ed had rock$hox make 'em forks ("future shocks") all through the mid 90's. Some were more futuristic than others, in that they had carbon fiber legs (most of which eventually delaminated), but others (like yours) were just rebadged rock$shoxs.
A decent fork for it's time, I try to find 'em cheap, rebuild 'em and get them on friends bikes, who are in your situation, needing a good starter fork on an older bike... or for those older guys (like me) who are beginning to need some suspension to ease the joint pain (=
Thanks Serge, those are some very useful resources!
My first thought was to just replace the fork, but I bought this older, less expensive bike to see if I would really use it enough to justify dropping some real cash... so I am going the low budget route on my tune-up/refurb.
The fork is silver and came stock (i believe) on a 94 Stumpjumper FS... I think it is listed as a "Specialized Future Shock" on the official component list... but it looks like a Mag2X. I will get a camera and post some pics of the bike, hopefully I can find out more about what I just bought. It seems to have some decent components like Magura hydraulic brakes... more to come.