Labeled as 15 years old but apparently frequently containing a portion of older whiskies. 

Bottled at old British 80 proof (46%).

Photo taken from scotchwhiskyauctions.com which is one of the few places you'd find this sort of thing.  

N: A little white pepper upfront. Mineral with a touch of mint. Opens up to reveal some orange notes, some gentle sherry undertones clearly there but not leading the way. Fresh tobacco.

P: Thick and rich mouthfeel, again leading slightly mineral with a mint aspect; some oranges. Baked bread, a touch of cranberry, nice gentle sherry presence acting as a quiet foundation in this - quite a contrast to modern Macallan. Gentle pepper, even a slightly more direct citrus note (fresh squeezed lemon). Apple skin is here but it's more textural than taste. Lightly waxy, some wood. White pepper.

F: Mouth-coating, lasting. Mint notes present, that mineral quality continues and it's got a nice sherry base. Hints of walnuts, plenty of apple skin, drying to oak and later tobacco. 

The change Macallan saw in the 1950s based on the CH&K bottlings is pretty amazing. This is unlike any Macallan I've had - very mineral - and while I liked it, it's not a knee-buckler.