Since 1838, Maison Mumm's exclusive Champagne have remained a secret of the elite circle. For nearly 200 years, successive chairmen have honored this tradition by gifting the House's top cuvées, which were marked as reserved in the Cellar Master’s books with the initials “RSRV”. Continuing this legacy, RSRV stands as the unique set of five 100% Grand Cru Cuvees.