The Sovereign Grain Invergordon 31 year old 0.7L 53.7% vintage 1988; Bottle #184 of 399 The single grain whisky, from the Invergordon distillery in the Highlands, was bottled by Glasgow-based independent bottler Hunter Laing as part of their Sovereign series. This version was distilled in early 1988 and aged in a single hogshead cask for more than three decades. A limited edition of 399 bottles, it is unfiltered cold, without artificial colors, and has a natural cask strength of 53.7%. Estimated price: £750-850