Any one know champaigns?

[OhioJim]

I spent $125.00 for a bottle of champaign to celebrate our seventh wedding anniversary in 1972. It was a bottle of Henriot Reserve Baron Philippe de Rothschild, vintage 1971. It came beautifully packed in an impressive casket type box. My wife decided it was too expensive to drink. So she stashed it away in a closet. Can anyone suggest where I might find out how much its worth? I don't have a clue!