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Probably not. Champagne in Cognac is a region.
Actually this cognac is a blend of some crus: Grande Champagne, Petite Champagne, Borderies and Fin Bois. However, you can buy this cognac for approx. $235, e.g. here http://www.cognac-expert.com/xo-cognac/hennessy-xo-cognac-extra-old
Most bottles have a date on the label.
I think please review the question. Are you asking for champagne or cognac??? Champagne is served chilled whereas cognac is served at room temperature(if drinking neat) or served alongwith warm water. Actually, I believe s/he is asking about fine champagne, which is a type of cognac. You can drink fine champagne either at room temperature or chilled - I personally would recommend chilled.
Find on the official site of Courvoisier (the original name of the Cognac de Napoleon) : However old the bottle is, as long it has been stored upright and in good conditions, ie. no direct light, away from a source of heat, you may enjoy the contents. cognac does not alter once it has been bottled.
There are two regular sizes of cognac bottles (I think this is what you had in mind). In Europe the regular size of a cognac bottle is 700 ml. e.g. the bottle size of this Hennessy XO Extra Old Cognac. In the US the regular bottle is 750 ml. e.g. the D'Ussé VSOP Cognac.
No, Hennesey is a brandy, specifically a cognac. Brandies are distilled from wine, cognac is distilled from the wine of grapes from in or near the champagne region in France. Not to be confused with the sparkling wine called champagne.
Some people like to drink Remy Martin Champagne Cognac chilled or on ice. People feel the coldness makes the drink taste better.
I'd give cognac, it's classier.
It depends on several factors such as age, cru and so on. This e.g. is a Courvoisier Grande Fine Champagne cognac bottled in the 1950s, that's worth approx $300
It was his favorite cognac.
Vines of Bordeaux, absinthe, cognac, and of course, le champagne.