Vintage Pyrex has gained significant popularity, with some dishes fetching hundreds online. The primary way to determine if a Pyrex dish is vintage is by examining its bottom for the logo. If it reads "PYREX" in capital letters, itâs likely vintage, whereas a lowercase "pyrex" indicates a more recent production. This branding change began in the late 1970s, reflecting a shift in materials as well, moving from durable borosilicate glass to newer compositions. Collectors must also note that branding may vary internationally, causing possible misidentifications.
The easiest way to identify vintage Pyrex is by its logo; an all-caps 'PYREX' indicates it's likely vintage, while a lowercase 'pyrex' suggests it's newer.
The shift to the lowercase 'pyrex' branding occurred in the late 1970s and coincided with a change in the glass material, moving away from high-quality borosilicate glass.
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