This is from the Chateau Margaux website:
"Château Margaux 1973
A certain finesse comes through in this light but already tired wine. It should be drunk now. (September 2002)
Weather
After a rainy month of July, August was very hot (the hottest since 1949), then September was very rainy again. The crop was very large and so was partly diluted and was never able to finish off its ripening process correctly. (The picking began 26th September)"