Masterpiece Blend 1966 Sealed Bottle of Wwhiskey a Product of Calvert of Canada LTD.

I have a 1966 sealed bottle in original gift box with Masterpiece on outside of box. The label on the face of the bottle reads Canadian Masterpiece imported Blended Canadian Whiskey a product of Calvert of Canada LTD. On the label on the back is No 510469. The label states 4/5 Quart 80 proof blend of six great Calvert distilleries in Canada: Gimli, Man., Waterloo, Ont., Beaupre, Que.,New Westminster, B.C., Amherstburg, Ont., Montreal, Que.. Can you tell me about this whiskey gift and it's value?