Basically what GWH is saying is that this is from the late 60's and not a very old 7yo bottle.
By the way you bottle is still a 7yo bottle of whiskey just that it is a 40 odd year old bottle of 7yo whiskey
However, Your bottle is a nice bottle to have and will command a premium at the same time but not megga money.
Older versions get between €400-500 usually so I would place your's in the €200-300 bracket but I'm open to correction if anybody feels it's worth more (or less).
I personally would not offer much more than €200 as I'd be buying to drink (I'm not offering by the way

) but if you get a few offers then you can push the price and see where it goes. If you do decide to sell please keep negotiations in the back ground (i.e. via the forum PM facility, email or phone etc) and not on the actual forum.