Wine from a friend

[StevenJ]

What do I have? A bottle of German Riesling Brut(Sparkling Wine) has sat in my basement for a few years. A friend told me it was very expensive when he handed it over to me. I have waited for the right time to open it; New Years? Before I do I would like to find out what I have.
The label reads "JAHRGANGSSEKT 1978" "DEINHARD & Co." serial#12350 of 18578 bottles??? If anyone has any knowledge about this wine please share it with me.

[This message has been edited by StevenJ (edited 12-29-1999).]