Question: What do numbers on 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.

Why did my Pyrex explode?

When a Pyrex bowl is heated or cooled rapidly, different parts of the bowl expand or contract by different amounts, causing stress. If the stress is too extreme, the bowls structure will fail, causing a spectacular shattering effect.

Is my Pyrex valuable?

The price often depends on the objects desirability and condition. While a set of old custard cups may fail to sell at fifty cents, a four-color, four-piece mixing bowl set can cost from $45 to $65. Patterned Pyrex—such as the 1956 Pink Daisy or the 1983 Colonial Mist—also tend to be valuable as a collectors item.

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