Since 1842, the most elaborate and traditional "Méthode Traditionnelle" originating from Champagne has been cultivated and developed with the greatest care at Schlumberger. Each bottle of Schlumberger matures on its lees for at least 12 months, the Reserve and Great Reserve even longer. The cellar dot on the bottom of the bottle is Schlumberger's quality mark for production according to the Méthode Traditionnelle.