Last Updated: Sep 25, 2016 Views: 817
Thank you for contacting us. I will offer you some information based on what I was able to find in our Library. The Rakow Research Library is a part of the Corning Museum of Glass. We are not a part of Corning, Incorporated. It is possible that the Corning Incorporated Department of Archives and Records Management may have more information for you.
I am attaching a scan from "The complete guide to Corning Ware & Visions Cookware" by Coroneos. It will give a bit of product history. I am also attaching a bibliography on Visions Cookware. If you would like to read any of the items listed, please take the citation to your local library and ask the librarian to request the item through Interlibrary Loan. We are happy to lend microfilm or second copies of books and send copies of articles.
I checked a few of Corning's trade catalogs from the 1980's and 1990's and was unable to find any reference to Visions being sold with the top being from one factory and the bottom from another. The pdf does detail how the Visions line was first produced in France as you mentioned and then shipped to the US to be sold prior to the opening of the plant in West Virginia. Corning did try to produce pieces that could be sold in both the American and European market. This may explain why your piece lists both inches and centimeters for the lid size/diameter. Markings did also vary slightly based on the year or timeframe of production.
Please let me know if you have trouble opening the attachments or need further information.