This is a cask-strength Speyside single malt from Glen Grant, distilled in 2003 and bottled at 22 years old. Glen Grant is widely known for a refined house style, and extended maturation can add more depth, oak influence, and complexity while still keeping the whisky approachable.
As an independent bottling from Decadent Drams, it is presented at 52.0% ABV without dilution to a lower bottling strength. That usually means a fuller texture and more concentrated flavour, and a little water may help open it up in the glass.