Robert Moncuit Champagne Extra Brut BdB Grand Cru Reserve Perpetuelle NV

From the importer: Robert Moncuit's Reserve Perpetuelle is a blend of reserve wines from various vintages, each of which is kept in tank separately before they are blended. The current release spans six different vintages, 2006 - 2012, and the dosage is 2 grams per liter. It is the same wine that the domaine used to just call Blanc de Blancs Extra NV.