Macallan 18 years old, four steps to sherriness

Macallan 18 yo 1991/2010 (55.3%, Duncan Taylor, Rare Auld, cask #9714, 288 bottles) - Macallan 18 yo 1990/2010 (54.1%, Duncan Taylor, Rare Auld, cask #18222, 240 bottles) - Macallan 18 yo 1987/2006 (58.4%, Duncan Taylor, Rare Auld, sherry, cask #9794, 271 bottles) - Macallan 18 yo 1996/2004 ?Sherry Oak? (43%, OB)...