Full review in a flight of six single grain: https://keinehalbendrinks.de/2022/08/24/single-grain-single-cask-teil-2/
Very briefly it is clearly alcoholic. But that soon wears off. Then come oatmeal and raisins. It gets nutty. Later herbs and leather notes appear.
Rum, grape, nut and coconut give way to vanilla and old books. Then pepper and herbs are added.
Still lots of rum notes, but also herbs and peppermint again. Fruits and dried fruits. the age is more present now. The oak spice becomes more.