Help identifying an old whisky!

Hi All, I recently had a look through my father's liquor cabinet and came across a few old bottles of liquor, one of which is an old bottle of Dewar's White Label. Here is a link to a couple of pics:

http://cid-82fb2fe4d13c4ef3.skydrive....Public/Whisky

I'd primarily like to know how old it is, and if anyone knows what it might be worth, that would be great also.

thanks!
damien