This is a vintage bottling of Glenesk from independent bottler Silver Seal. This was distilled in 1971 and aged over 30 years before being bottled at 49% ABV. 

Known as Glenesk from 1980-85, and prior to that as Hillside since 1964, this distillery produced both malt and grain at different stages in its history. It is not often seen officially bottled, but has contributed to several Rare Malts Selection releases. Distilling ceased there entirely in 1985, and the site operates exclusively as a maltings now

Silver Seal are, in a roundabout way, something of a successor to the iconic Sestante - an Italian independent bottler which operated until the early 1990's. Indeed, Silver Seal owner Massimo Righi is aided in his search for the best casks of rare whisky and rum by one of Sestante's original founders. Although they are far from prolific in output, they are held in high regard by whisky drinkers and collectors alike.