Value of Usquaebach

I have a stone jug bottle of Usquaebach 40%, 710ml, Sealed in Bond Glasgow.
Blended and Bottled by Douglas Laing and Co Ltd Glasgow, Scotland.
Imported by Twelve Stone Flagons Ltd, Castle Shannon Pennsylvania.

I cannot find any info on this bottle or very much even on the brand. Is it any good?
It's never been opened and has been handed down from two deaths already. I'm not a big scotch drinker myself, but if its good high end or special stuff, I'll keep it for myself and some of my close friends. I don't want to make a mistake and let someone who won't appreciate it, come and drink it just, to get pissed.

Bill