I am very sure Billy talked about these casks in the tasting you can watch on youtube. He called them "the nectar of the gods" and I could not agree more. Every time I try it I can't believe this is as good as it is. If I am correct these are chateau mouton bordeaux casks.
I would give this 100/100 personally but that would go a little too far and already staked away a whole bunch.
These bottles were only available in Germany, but there will most likely be more soon, that hopefully will be just as good.