Use the glass markings, stamps, and logos on the pieces themselves to identify when the glass was produced. The oldest Pyrex markings should be on the bottom of glass pieces and feature Pyrex in all capital letters inside a circle with CG for Corning Glassworks.

How can you tell old Pyrex from new Pyrex?

1:082:28Old (real) Pyrex vs. New (not) Pyrex - YouTubeYouTubeStart of suggested clipEnd of suggested clipRight Pyrex. But this is completely different product soda lime glass borosilicate soda lime glass.MoreRight Pyrex. But this is completely different product soda lime glass borosilicate soda lime glass. So. If you ever out and youre looking for you know the real Pyrex.

What do the numbers on vintage Pyrex mean?

In many but not all cases, the trailing digit of the model number corresponds to the capacity in pints of the bowl or dish, e.g. #043 = 1½ quarts = 3 pints. Sets were typically assigned catalog numbers similar to the model number sequence of the pieces they contained, e.g. a #470 set contained 1 each 471, 472, and 473.

Can Pyrex go straight from fridge to oven?

It is considered safe, however, to transfer a Pyrex dish directly from the refrigerator or freezer to a hot oven, provided it has been properly preheated -- some ovens use the broiler element to heat up to the desired temperature. A Pyrex pie plate is almost the American standard pie dish.

What is the most collectable Pyrex?

Patterned Pyrex—such as the 1956 Pink Daisy or the 1983 Colonial Mist—also tend to be valuable as a collectors item. Some patterned collections, like the 1959 Lucky in Love heart and four-leaf clover design, have been valued as high as $4,000 for one bowl.