Dating pyrex glass, vintage pyrex
The oval divided dishes made before the mids were not marked with a model number. The configuration of the backstamp would undergo a few revisions after the introduction of opal glass kitchenware in In many cases, unknowns were named by other people.
Pyrex ovenware has been a staple in American households for many decades. On some pieces, this was also enclosed in a ring. Remove underscore between first and second portions of address.
Now known as Corning Incorporated. Side by side comparisons, however, are often necessary to distinguish among them. Any 4-quart bowl in a color of other than yellow must therefore be dated no earlier than Here's a great identification book for those occasions, loaded with shelves of pictured Fire King dating pyrex glass bowls, datings pyrex glass, and other items, along with patterns facts and prices.
All Pyrex color ware was discontinued after about Please bookmark this site and I hope you will return often. Since pattern collections and promotional pieces were available for relatively finite periods, knowing their years of introduction and discontinuance can also help narrow down dating somewhat. Sometimes pieces are known to be "Promotional" but do not have any official name, so we or others have given it a name.
On many pieces, various numbers and sometimes letters are seen in and around the backstamp. Extreme temps will only impact an untempered piece of glass.
AGEE PYREX — from 1930s until about 1972
New patterns were introduced in keeping with changing tastes, so they can also give clues as to time period. The backstamp seen on various items prior to that echoes a MacBeth-Evans trademark, but one not previously used on their glassware: There are links with bullet points near the top of the page to facilitate this.
Click here to go to my Home Page. If this is your first time here, please read the sidebar at right for tips on notation we've used throughout these guides.