How do I know if my CorningWare is vintage?

Online Answer
CorningWare is known for its patterns and the pattern on your piece can tell you if it is vintage or not. The original pattern was a triple-cornflower motif and it was normally blue on a white dish. This pattern was consistently produced throughout the years while others were made for specific periods of time.
Related Questions 📌
Simply dampen with water and add a little liquid dish soap. Then, using the scrubber side, simply apply a slight amount of pressure and scrub. The marks will simply disappear like magic. Don't worry, it doesn't scratch the CorningWare, and you will be surprised how easily the marks are removed.
The enclosed CORNINGWARE® products are made from glass-ceramic and can be used in conventional, convection, toaster and microwave ovens, and on a rangetop, under a broiler, in the refrigerator, freezer and dishwasher..
All CorningWare® oven bakeware products (including metallic-banded French White® products) can be used in conventional, convection and microwave ovens as well as in the refrigerator, freezer and dishwasher.
Corning ware is the best substitute to the dutch oven. It is made of glass-ceramic hybrid material called Pyroceram. The use of it is the same as that of dutch oven.
The one piece that is still fetching a lot of money, but not as much as others, is the blue floral pattern that is the most common in most households (in the photo above). More rare patterns such as the Wildflower pattern (made from 1977 to 1984) or Floral Bouquet (made from 1971 to 1975) are going for up to $10,000..