Ston, please post photos of your bottles. We know we can have your bottle of Bell's dated, but not sure on the other, so post the photos which may help. As for value, contact either mctears.com or bonhams.com Whether or not you should drink it depends on you. After all these years and including how it's been stored will definitely have some impact on the taste. The worst culprit is air which can seep into even the best sealed bottles. I just had a 37 year Glen Garioch scotch which had probably been on a shelf for well over 20 years and it was still outstanding (several of us all in agreement). However, we also had different scotches that had been stored for the same amount of time that did not fare as well. Still good, but the taste had certainly changed a bit. You may want to see what type of a value you get first and then go from there. Please keep us posted on your findings regarding value.