This Karuizawa whisk has been aged in Bourbon casks, which is unusual for the distillery. Bottled for Shinanoya a Japanese food and spirits importer to celebrate their 5th Anniversary in 2012\\. This is one of the 228 bottles ever released.

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https://dekanta.com/store/karuizawa-1981-31-year-old-cask-4961-shinanoya-5th-anniversary/