Glenfeddich Special Reserve
I was given a 1.75L bottle of Glenfeddich Special Reserve, with-out one of those paper strips across the top of the cap, like the liquor stores have, and I've had this bottle, which is in a gold colored swing holder, since about 1988. How do I tell if it's got any value? Markings on the bottom of the bottle: A number "6" and three numbers in a row "6198". Never been opened. Am I sitting on a gold mine???