The Provenance Series from the Bruichladdich Distillery concentrates on demonstrating how many variables create flavour in their single malt - from different barley types to unique casks. 
This limited release was distilled in 2007 using Optic barley, before being aged for 16 years in a single 1st Fill Bourbon Barrel. It was aged at natural cask strength, without chill-filtration or artificial colouring.