Should you drink or sell?
Well 1970 is old but not that old at least in spirit time. Blended whisky is made from a recipe that has not changed for many years. Sometimes tweeking happens and there be subtle changes to the blend but for the most part they are very consistant. So having said that and remember if its clear to the eye its probably good to drink. So Thanksgiving and Christmas are coming so I sit down with friends and family and enjoy. Hope this helps.