Alpenglow Whisky #21 is a single malt whisky bottled at 43.0% ABV. Single malt is made from malted barley at one distillery, and this style is often valued for showing a distillery's character with clarity.
The mention of an "Other Cask" suggests maturation or finishing outside the most common cask descriptions, which may add an extra layer of character. Without confirmed details on the cask type or flavour profile, it is best approached as a malt whisky where the wood influence may play a supporting role alongside the spirit.