Some people seem to do well on EBay, feel free to post auction links in here. Also stumbled upon this site http://www.whiskyauction.com/
, havent heard anything good or bad about it.
A search on the Whisky Search for auction
thows up a few sites.
This sounds like an expensive bottle and I would suggest posting lots more detail, maybe some pictures if you have them.
Please keep us updated with the progress if you sell it. Helps other forum members if they can see the results of these posts.