After 23 years of aging the whisky were then placed into former Caribbean Rum casks that once held Solera aged rums, for a 6 months. During that period, it picked up the distinctive rum features which added a new dimension to his thoroughly engaging whisky.The Classic Cask 23 Year Old Selection began with the acquisition of superlative casks of single casks of single malt Scotch whiskies from Speyside, the Highlands and Island distilleries and premium aged grain whiskies. All were matured in their original casks for a minimum of 23 years. The whiskies were judiciously blended and then married in vats for 6 months. The blend was returned to casks for additional maturation and finishing.