The Glenlivet Alpha released in 2013 with much secrecy, only 3350 bottles were released worldwide. A single malt with no cask, age statement or tasting information. Part of a 4 bottle series celebrating the Enigma Code breakers of WWII. The other bottles are Cypher,Code and Enigma. The makers wanted users to smell/taste and decide for themsleves what the whisky was.
Spoiler: The casks for this malt were 2nd fill vigin oak casks that has previously held whisky not the normal sherry or bourbon.
Very hard to find due to limited numbers,