The R.D. stands for “Recently Disgorged” meaning rather than being released immediately after secondary fermentation, the wine remains in bottle often for much longer, gaining even more of that incredible magical complexity that only Champagne can achieve.
“Disgorged on July 10, 2020, with three grams per liter dosage, Bollinger's eagerly awaited 2007 Extra-Brut R. D. is beautiful, unwinding in the glass with aromas of crisp orchard fruit, citrus pith and white flowers mingled with hints of honey, orange oil, buttery pastry, English walnuts and delicately spicy bass notes. Full-bodied, vibrant and incisive, it's unusually elegant and structurally fine-boned for what is routinely one of Champagne's more muscular tête de cuvées, with a bright spine of acidity that's cloaked in vibrant, concentrated fruit, complemented by a pearly pinpoint mousse and concluding with an intensely sapid finish. Long and penetrating, this is a tightly coiled R. D. that will reward bottle age.”
97 points Wine Advocate