The MUT 34mm launched in 1992, started with Cal 839, but introduced Cal 849 in 1994.
The exhibition back debuted in 1999 with the Master Blacks - MUT, Master Moon, Geographique, etc. In 2000, the silver dials began to have exhibition backs.
My favorite was the 250-piece LE Platinum edition from 2001 (ManRef 145.60.80).
-Dean