This is a very exciting Macallan, distilled in May 1977 and bottled in June 2017 after an impressive 40 years in the cask.
Old Particular is Douglas Laing's flagship label, and was launched in 2013 after their Old Malt Cask series became part of the portfolio of the newly established Hunter Laing. Xtra Old Particular is the premium version of the brand, and is reserved for casks the company considers the Laing "family jewels."
One of 240 bottles.