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Abacus is our ultimate Cabernet Sauvignon. This very special solera style bottling of every ZD Reserve Cabernet Sauvignon ever produced is a vertical in a bottle. Abacus XVIII the most recent bottling of Abacus includes 24 vintages of Cabernet from 1992-2015. The resulting wine is a spectacular Cabernet Sauvignon having the complex and developed qualities of an aged wine along with the vibrant intensity of a youthful wine, melded together into one sumptuous wine.