There are very few single cask releases from Glenrothes. This one was a special release over in the US, just one of 519 bottles from the one cask.
1979 was the year that new stills were added to the stillroom and these casks are taken from this new set of stills.
Cask Number: 13458
57% ABV / 75cl
Bottle Number: 166 / 519
please note damage to lid