Dating pyrex primary bowls
The finish of the four bowls is still very shiny, with no cracks or chips.Overall, the bowls are in very good to excellent vintage condition.
The new Pyrex opal ware line was a result of a collaborative effort between Corning Glass Works and the United States government to create a sturdy, lightweight and unbreakable dish for soldiers during World War II.
A 1946 advertisement touted the new opal ware bowls as “2 ½ times as strong as ordinary bowls,” “Heat resistant for oven use,” and used “For mixing, baking, serving and storing.” As the earliest set released by Pyrex opal ware the new “Color Bowl Set” did not have standard model numbers such as 401, 402, 403 and 404 as we have come to know them today, but they are standard bowl sizes.
Originally released with a more defined foot the bottom of the bowls was redesigned in 1950, creating the version of Pyrex opal ware bowls with which we are now familiar.
In 1947 the four-piece Primary Colors Refrigerator Set was released in yellow, blue and red.
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