Unknown Gift ~ Your thoughts

[GYM3VDZ]

Hi there,
I'm a new member (first post), I'm asking for any information on an item,
Just had a birthday and received some very interesting bottles,
Yamazaki 12 ~ I'm now a Japanese Fan, Fantastic
Sainsbury's Dun Leire 8 ~ In glass as I type
Bushmills Black Bush
The Macallan 10

Also received a jug of Glen Garry c1970's ! which I have no idea about,
Do I pop the cork and enjoy. and sell jug on ebay for £5 ? ? ?
Anyone have a notion to what blend I may find inside, Is it a keeper ? ? ?
It was given as a gift in the late 70's and just brought out as a gift to me the other day.
~ Any Thoughts ~ See photo attached