Tannic vintage, the question is whether fruit outlasts the tannins.
Best 1975 I've had are Palmer ( 2 out of 3 were outstanding) and a
great bottle of Montrose..

I've had mixed results with Lafite, better showing than Bill's overall.
'75 Marguax didn't thrill.

Gruaud-Larose still needs time. Will fruit last? Lynch Bages is good,
not great.
Giscours was a nice surprise. Meyney and Gloria were nice a while ago,
but haven't tried (intact bottle) recently.