Letters on a Cognac bottle Crossword Clue

 The most common letters on a cognac bottle are V.S.O.P., which stands for "Very Superior Old Pale." This designation is used for cognacs that have been aged for at least four and a half years in oak barrels.

Other common letters on a cognac bottle include:

X.O., which stands for "Extra Old" and is used for cognacs that have been aged for at least six and a half years

Hors d'Age, which is French for "Beyond Age" and is used for cognacs that have been aged for at least ten years

Vintage, which is used for cognacs that have been made from grapes harvested in a single year

Some cognac bottles may also include the initials of the cognac house or the name of the region where the cognac was produced.

Here are some examples of cognac bottles with letters on them:

Hennessy V.S.O.P.

Remy Martin X.O.

Martell Cordon Bleu

Louis XIII de Rémy Martin

Frapin Château Fontpinot 2002

I hope this helps!