Remy Martin Champagne Cognac

[Sungy747]

I have a bottle of Remy Martin Champagne Cognac. I've contacted Remy direct and was told
"We think that you effectively have a rare bottle of Rémy Martin Cognac .
This blend is the ancestor of our most prestigious cognac Louis XIII de
Rémy Martin Grande Champagne Cognac. Over 1200 different eaux-de-vie, aged
between 40 and 100 years of age, have been selected, all coming from the
best growth area, situated at the heart of the Cognac region, the Grande
Champagne. Three generations of cellarmasters have been working to produce
this single decanter."
What I'm unsure of is the actual value of it. Can anyone help or give me any info on how/where to get it valued?