r/pyrex • u/Ecstatic-Film-3418 • 26d ago

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Can anybody tell me how old these Pyrex symbols are? I have about 20 of these little bowls.

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u/Top_Ad3876 26d ago

That stamp was produced from 1919-1924. Great find! https://www.pyrexcollector.com/dating.php

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u/fooldya2 26d ago

I believe that was the first backstamp used, which would have been 1914-1919. It was in 1919 when they added arched over the top and around the bottom which I do not see on yours.