Dom Perignon Vintage 1954

[Guest]

We have a single bottle of Cuvee Dom Perignon Vintage 1954 that was given to our son in the late 80's by the crew on the set of Bob Newhart Show. It has been on display in our home at a cooler room temperature (about 65-68 degrees). The label is printed "Champagne, Appellation d' Origine Controlee, Cuvee Dom Perignon Vintage 1954. Would this still be drinkable? Would it have a sale value?