Vintages: Eaux-de-vie from the same harvest year
All vintage Cognacs indicate on the label the harvest year of the grapes that went into the Cognac.
In the Cognac Delimited Region, eaux-de-vie specifically being matured for vintage Cognacs are generally aged in sealed casks or in separate vintage warehouses. A vintage warehouse is locked with double keys: one that remains with the owner and the other entrusted to the BNIC.
Vintage eaux-de-vie must be monitored extremely rigorously, to authenticate the age of Cognacs marketed as vintage.
Since blending is a key cultural element of Cognac’s identity, vintage Cognacs are not very common.