White Horse Scotch Whisky - How old? Value?

[bvnmel]

I recently acquired an unopened, numbered bottle of White Horse Blended Scotch Whisky, AF No.906777. The unbroken (red) tax stamp is # 735292689.
The bottle is in a painted tin, in excellent condition, manufactured by Barringer Wallis and Manners.

On the inside cover of the tin is a cardboard marketing card about Sir Peter Mackie; this card has a printed label on it # GK No.2735943. I am guessing that this label is part of the 'marketing" piece on the inside of the tin, and has not bearing on the question(s).

From my (limited) familiarity with the bottle and tin, I presume the bottle is at least 30 years old, but may be as old as 55 years. As an exclusive drinker of Scotch Whisky, I am interested in knowing how old this bottle is, and what it might be worth.

I am not a collector. If this botle has any kind of collectible value, I would more than likely donate it to an upcoming Charity Auction with which I am involved.

I attempted to attach photos of the bottle and tin for your perusal, but received a message saying I hadn't the proper security icons (?).

Thanks for any help may you be able to give in this search.

Best
bvnmel