The nose immediately gives this away as MGP. Huge rye with some pickle juice. On the palate it's got strong rye with some brown sugar notes to balance it out; it even has a touch of the sandalwood notes you get in prohibition era ryes. It tastes strong for the proof. The finish is very nice burnt sugar with rye.
This is really nice stuff, certainly identifiable as MGP but more complex and balanced than younger MGPs.