Wine of the Day, No. 688

Heitz Cellars could be called iconic or legendary or simply essential in the modern history of Napa Valley winemaking, a reputation that rests principally on its cabernet sauvignon wines. Among the greatest of those cabernets, at least from the late 1960s through the mid-1980s, were the bottlings from Martha's Vineyard, a 34-acre plot lying in the footh…