Forty Creek Whisky has for the past several years produced a special limited release whisky and allowed the public to participate in its release by offering to let those who pre-order the whisky to choose their own numbered bottle(s). These special release whiskies are built upon the foundation of the company’s flagship whisky, Forty Creek Barrel Select, and are actually versions of this whisky which have spent additional time finishing in certain selected oak barrels. (I think you can guess the nature of the ‘special cask’ for this particular offering.)
In 2009 the special release was spectacular, Forty Creek Portwood Reserve (2009).
Here is a link to the review of the #17 spirit on my Rum Howler Top 100 Spirits Countdown of the best spirits I have ever tasted.
#17 – Forty Creek Portwood Reserve (2009)
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You may follow my Countdown list of the 100 Best Spirits here: The Rum Howler 2015 – Top 100 Spirits
The Havana Club Barrel Proof Rum underwent a rather unique maturation process where it is first aged in old white oak barrels, and when the final rum is blended, it is then finished in specially ‘selected’ younger finishing casks. I have heard of this ‘Double Barrel’ approach with whisky, but the Havana Club Cuban Barrel Proof Rum, was the first rums that I know of which used older white oak maturation casks and then younger fresh oak finishing casks.
Knob Creek is the oldest of these small batch whiskeys, and is aged a full nine years in newly charred oak barrels, then bottled at 100 proof or 50 % alcohol by volume. The whiskey brand is owned by 
The Ron Zacapa Centenario XO is blended from these solera aged stocks which range in age from 6 years to 25 years. These stocks were aged in special cellars more than 7000 feet above sea level. The solera barrels are a mixture of reused American Bourbon, Sherry, Pedro Ximenez wines, and Cognac barrels. The combination of solera aging and the wide variety of reused barrels creates a highly complex rum with a rich aroma and flavour.
In case you did not know, these Plantation barrels began their life as French Cognac barrels which were then were used as the finishing barrels for Plantation’s fantastic XO Anniversary Rum (
The Rum Howler Blog 