I have a similar bottle with a cask# of 20014 and a bottle# of 129/300. Searching the web I found the following posting at www.scotchwiskyauctions.com:
"One-off bottling of an 11 year old Bowmore for the Duncan Group to celebrate 40 years of existence. 1966-2006. Bottled at 46% from cask no 20013. Bottle no 100 of only 220 bottles."
It **** for 50 British Pounds Sterling back in 2010. Hope this helps.