Valuation on McCallan-Glenlivet Single Malt

[invernessdude]

Hi there, I have had a bottle of single malt at the back of my cupboard that was given to me a few years ago for my then company's 25 anniversary. I would appreciate if someone could give me an idea as to its value or whether I should open it and 'sample its nectar'. Here are the details.

Murray McDavid
Speyside Single Malt
Scotch Whisky from Macallan-Glenlivet Distillery
Distilled in 1972
Cask Ref:MM2729
Distilled: October 1972
Bottled: August 1998
Cask Type Fresh Sherry

70cl 46% VOl

Any help would be appreciated.

Invernessdude.