I noticed in my Mom's liquor cabinet an unopened bottle of Dewar's that has a 1967 Queens award tag. Since she never drank Scotch it has to be about that vintage from when my dad was alive. There was no evaporation. It is definitely smoother than a new bottle of Dewars and quite drinkable straight up. Maybe it was smoother back then..I never considered Dewar's a smooth scotch, but good for a summertime Scotch and soda.