Never ever heard of this cru bourgeois, must be a very minor one. Given the fact that 1992 by long and large was the weakest vintage of the 1990s, and given the fact that you can count the 92s that still have ageing potential with one finger (Leoville Las Cases), this wine is over the hill with a probability of 99.9 percent.
Open & try, and have a backup bottle ready.
M.