green bottle of bells 12 year old whisky

Can anyone help me to find out the age and value of my dads green square bottle of 12 year old bells whisky

It was a present 40 years ago and is unopened it says
Bells De Lux
Blended Scotch Whisky
26 2/3rds flo/oz
70 proof
Produce of Scotland
Blended + Bottled By Arthur Bells and Sons Ltd
100% Scotch Whiskies

I can post a photo if this will help I just need to work out how!
If you can help me this would make an old cockney gent a happy man and me too thanks Christine

[Jojo]

Christine - we can have your bottle dated, but will need a photo. Just hit reply to this, then click on the paper clip icon above the message body, browse for your images on your computer and upload. If the photo is too large, it won't work and you'll have to resize. Once it uploads, click on "Close this window" (upper right) Then, click on the paper click icon again and it will read "Manage Attachments". Click right on the images and it will insert. You won't immediately see the image on your post. It will read -

(ATTACH)and then a number in this spot(/ATTACH) Once you hit "Submit Reply", you will then be able to see your image(s).

Let me know how it goes. As for value, you'll have to contact McTears.com or Bonhams.com

I do have some of this vintage botlles and know where to buy them. but doesn't know the age of them???. here you can still go and buy one.