Johnnie Walker Masters of Flavour 48 Year Old is crafted using fleetingly rare whiskies - all aged for at least 48 years - from the four "ghost" distilleries of Port Dundas, Brora, Glen Albyn and Glenury Royal. It is the third and final expression in the Johnnie Walker Masters series, following The John Walker Master's Edition and Johnnie Walker Master's Ruby Reserve. There are only 288 bottles of this exceptionally rare whisky available. Johnnie Walker Masters of Flavour celebrates the art of whisky making, shining a light on how each of the four main steps in the process - malting, distilling, cask maturation and then blending - contribute equally to creating extraordinary flavours - from grain to glass.