The 1977 Biondi-Santi "Il Greppo" Brunello di Montalcino Riserva is a legendary wine from an "exceptional" vintage, produced from the estate's oldest vines (25+ years). It is renowned for its immense longevity and is often described as having a "magical" balance of power and elegance, with notes of dried red fruits, leather, tobacco, and balsamic herbs.