Vintage Corning Ware Blue Cornflower P-1 3/4-B Casserole Dish 1.75qt w/Pyrex Lid. This vintage collectible Corning Ware Blue Cornflower pattern is displayed on 2 of 4 sides with official stamp of authenticity displayed clearly in bottom. It is the first pattern made by Corning Ware in 1958. This is Corning Ware Blue Cornflower.