Trying to Identify a Scotch

Hello,

My grandfather recently gave me an unopened quart bottle of Haig & Haig "Dimpled Pinch". I'm trying to figure out just how old this thing is, it's value, and whether or not it would ever be worth opening.

Here are some pictures:
http://www.facebook.com/album.php?ai...c&id=883525093

Aside from what you can see, here's what I can tell about the background. The price label (difficult to read in the photo) is $3.95. The back label reads "Purchased from an ALLDERS INTERNATIONAL SHOP" customs stock No. 10. The bottle has some sort of serial number on the back label 6122. In the glass of the bottom bottle, there's the following stamp:

Z898
HAIG & HAIG
A 13
SCOTLAND

My grandfather did a lot of business travel in the 60s and 70s. Based on the label and what I know, it's likely he purchased this in a duty free shop on the way back from a trip to London. If I had to take a wild stab, I'd say 1970s but I don't really know for sure.

Any ideas?

Thanks in advance