Vintage Corning Ware Blue Cornflower 1 Qt. P-1-B w/ PYREX Lid A7C 1st Blk Mark. This is one of 2 listings for vintage Corning Ware 1 quart square casseroles with PYREX lids A7C. This listing is for the casserole that has the first black hallmark 1961 – 1966; no black cornflowers in the hallmark. Corning Ware 1 Qt. Made in the USA There is slight signs of use on the interior which will most probably come out with a little more elbow grease. The lid looks great until you run your fingers around the edge and discover a edge chip and a rough spot… The bowl section measures 7 1/8″ X 8 7/8″ X 2 1/4″ and the lid measures 7″ square. Working in retail for many years has taught me about fine china, crystal and sterling silver. I also have studied antiques focusing on Asian antiques. I value integrity in all of my listings by presenting each item with the utmost accuracy so that my buyers can feel secure that the item they will receive is exactly what is photographed and described! Also feel free to request additional photos if what want to see is not shown in the listing photos. Get Supersized Images & Free Image Hosting. Create your brand with Auctiva’s. Attention Sellers – Get Templates Image Hosting, Scheduling at Auctiva. Com. Track Page Views With.