The Pyrex obsession—or should we say passion—is real. Plenty of us are still holding onto our mom's or grandma's colorful nesting bowl sets and pretty patterned casserole dishes, and there's even a blog and a Facebook group for the more dedicated collectors. The company has been around for more than 100 years, after all. But did you know your durable glassware might actually be worth something (well, beyond cherished childhood memories)?

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Some vintage Pyrex can earn up to $3,000, reports NPR—nevermind that it's not dishwasher safe, and it's a pain to lug around compared to modern iterations. Sure enough, we found a 1950s set selling for $1,850 on Etsy, and one from 1960 for $700 on eBay. There's even a rare vintage Pyrex bowl mold going for $1,000. Do some research to determine the year and style of your Pyrex: You may just have a rare find on your hands.

Maybe even more surprising than their value is the fact that people continue to use them regularly in baking and cooking. But that's the magic of a high-quality product. "I think it will always remain collectible, just because of the durability of it," Michael Barber, author of the Pyrex Passion blog, told NPR. "These bowls can be carried on through five generations and still look as good and be as useful as they were 100 years ago."

(h/t: NPR)

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Taysha Murtaugh
Lifestyle Editor

Taysha Murtaugh was the Lifestyle Editor at CountryLiving.com.