valuation please: boxed Extra Special JW black label from 1966

[papa_w]

Hi,

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.

[Jojo]

We're not offering valuations at this time, however, it's possible for us to date your bottle. If you would like it to be dated, we'll need you to post photos. Please be sure to include the closure. :D

[papa_w]

hi,

it's taken some time, but I have the bottle now, or should I say, I have the box.

it is unopened and is sealed with the Duty Free lables at each end, so I am reluctant to open them in case this reduces the value at all.

I know it's a 1966 bottle as my papa knows exactly when he bought it.

I have enclosed the photos and would like to know how I could have it valued please as my papa would like to know if he should drink it or sell it... :D

Many thanks in advance for any help/advice.