The Mortlach 1989 33-Year-Old Adelphi Selection is a highly limited single-cask release bottled in 2023 to celebrate Adelphi Limited's 30th anniversary. Drawn from single cask #6663, this expression is a rare departure from Mortlach’s typical sherry-matured profile, offering a brighter, fruitier character due to its long maturation in a refill bourbon hogshead.