valuation please: boxed Extra Special JW black label from 1966
we have an unopened bottle of "Johnnie Walker Black Label 'Extra Special' Old Scotch" in a presentation box which was purchased in 1966 for 6 pounds 49.
On the bottle it also says Duty Free Export Only and on the box it has a number: 10225
I would be grateful if anyone can tell us if this is a valuable bottle, or if my papa should just crack it open and enjoy it finally !!
thanks in advance for your help.