Supernova Secret Islay 15 Year Old 2009 (Connoisseurs Dram) 50cl Whisky

Which Islay distillery could this secretive single malt have come from? Named Supernova, it was distilled in 2009 and spent 15 years maturing in a single first-fill oloroso sherry cask before bottling in 2024 for DH Global Spirits Connoisseurs Dram collection. A release of 422 bottles.