Very well could be an mrv since it is that old. Is it thin rimmed like a cobra or roc? Look forward to seeing the pics. Take a side profile, top, and bottom if possible.
How in the world did you come across that disc? Funny. I got mine in 2001 maybe 2002 from Scott Papa who is a Discraft pro in WA. He sponsored Randall Roberts for some time (I think he no longer plays competatively although not sure). The name of thier team was or is Doctor Disc and R2D2 stood for Randall Roberts Doctor Disc. He was a beast at like 6;5 240+. Anywho, mine is a real gummy and opaque red XL. Be interested to hear more about what your disc might be. Definately Discraft though.