If your piece has other markings, use the guide for marked items instead.
There is little doubt that the decorated opal bowls are made of pyrex glass. There are surviving ads for some of them, and many have matching casserole dishes and other pieces. Nevertheless, as with all unmarked glassware, secondhand owners need to make their own decision whether or not to treat an unmarked item as heat-proof or microwave-safe. The author of this website is not responsible for deciding whether your unmarked bowl is made of pyrex glass or not.
Advertisements and mint-condition items have confirmed that Crown used
packaging and stickers to identify unmarked mixing bowls as pyrex glass
when they were originally sold.
The shape shown on the left was advertised in the 1960s and 1970s, and could be bought with a candle-warmer stand, as seen in this 1963 ad for Crown gifts. The percolator version has a glass knob on the lid.
Handle and lid shape are the keys to distinguishing Crown's coffee jugs
from other brands.
Some earlier models can be seen in these ads:
Pyrex glass
cannot be heated directly on the stovetop.
This is why Crown Pyrex's percolator instruction leaflet
showed the vessel protected by a wire gauze mat.
As stoves and cooktops vary, you should ask the
manufacturer of your appliance for the correct method to use today.
Juice jugs were available from the mid 1960s and were often sold in a set with matching tumblers, which would be made of ordinary glass. The decoration shown at the left, Golden Frost, was available on a wide range of Crown products.
It is unclear whether all juice jugs were made of pyrex glass.
Some Crown juice sets can be seen in these ads:
As they are unmarked,
it is wise to treat all juice jugs as though
they are made of ordinary glass, not pyrex.
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Disclaimer:
In Australia, the name PYREX
is currently registered as a trademark owned
by Corning Incorporated, USA.
This website has no association with Corning Incorporated, Crown Commercial,
or any manufacturer of heatproof glassware.