The oldest consumer Pyrex pieces date back to 1915, when Corning Glass Works first launched the brand. These original pieces were all transparent, clear borosilicate glass ovenware.
The rarest and most valuable vintage Pyrex pattern is widely considered to be Lucky in Love. Released in 1959 as a promotional piece, it features pink hearts and green shamrocks on a 111-quart casserole dish. Due to its extremely limited test release, pristine pieces can sell for thousands of dollars at auction.
To date Pyrex, flip the piece over and examine the backstamp, logo, and inventory numbers. The branding, material, and shape offer the clearest clues to determine when a piece was manufactured.
Vintage Pyrex is highly sought after by collectors and mid-century design enthusiasts, with specific sets and rare promotional items fetching anywhere from a few hundred to thousands of dollars. Rarity, pristine condition, and whether a piece was sold as a limited-edition promotion heavily drive its value.
The most valuable vintage Pyrex dishes can fetch anywhere from $1,000 to over $5,000 on secondary markets. The highest-valued pieces are limited-run promotional items, color test pieces, and unreleased patterns. Complete sets in mint condition with their original cradles and lids command the highest premiums.
Vintage Pyrex refers to glassware manufactured by Corning Glass Works between the 1940s and 1970s. Authentic pieces feature a distinct, highly durable borosilicate glass.
The most common and popular vintage Pyrex patterns are Butterfly Gold and Spring Blossom Green (often called "Crazy Daisy"). Produced in the 1970s and 1980s, these were mass-marketed and often paired with Corelle dinnerware, making them kitchen staples in millions of homes.
Jolene Forrester of JoRetro in Havre de Grace, Maryland—who hosts the semi-annual Pyrex & Vintage Fest—says pieces in “pinks and turquoises, which instantly stand out and were produced in more limited quantities,” are especially sought after.
Numbers on the bottom of vintage Pyrex dishes are product identification codes indicating the mold size and model type. These 3 or 4-digit numbers allow collectors to identify specific bowls, casseroles, or lids, often with the last digit denoting capacity in pints or quarts (e.g., 401 = 1.5-pint bowl).
How you handle old Pyrex depends entirely on its condition and value. For safety, always check for chips and remember to dispose of severely damaged or broken pieces in the regular trash, as they cannot be recycled.
Pyrex can last a long time. If you have Pyrex that's still in good condition (i.e., no cracks or chips in the glass), don't throw it away. Give it away or donate it to a thrift shop.
The naming of these new pieces as "Cinderella" likely had much to do with the popularity of the Cinderella story current at the time both in film and on Broadway. Corning marketers also hoped the underlying theme of a coveted glass object would have a subliminal effect on consumers.
NO - Do not use Pyrex® glassware on the stovetop (open flame, electric burner), under the broiler, in a toaster oven, or on a barbecue grill.
Dating vintage Pyrex involves examining its logos, model numbers, base shape, and patterns. With a few key details, you can pinpoint the era of almost any piece.
"Between the years of the mid-1940's to mid-1980's, Pyrex released more than 150 patterns, including customized and promotional sets. These are some of the most sought-after due to their limited production," Wright shares.
The Lucky In Love design is printed on the one-quart Round Casserole (473) and remains one of the most elusive Pyrex designs ever created by Corning Glass Works. Released in 1959, Lucky In Love is most likely a limited release product or even a test piece.
The most sought-after vintage Pyrex features unique colors, promotional motifs, and limited-release production runs. Highly prized sets like the 1958 Lucky in Love Lucky in Love, Atomic Eyes Atomic Eyes, and Golden Sunflower Golden Sunflower Daisy routinely command thousands of dollars among collectors.
Plastic #5 - PP (Polypropylene)
Used in production of most yogurt containers, some pancake syrup bottles, and bottle caps. Can be recycled into plastic lumber, bins, car battery cases, brooms, and ice scrapers.
Patterned Pyrex, like the 1956 Pink Daisy or 1957 Butterprint, is highly collectible and can be worth hundreds of dollars depending on condition. Authentic Pyrex pieces can often be identified by their back stamps, which were used between 1915 and 1965, or by unique characteristics like yellowish or blue-tinted glass.
The Pyrex controversy centers on the manufacturer switching the material of its consumer bakeware from highly heat-resistant borosilicate glass to cheaper, tempered soda-lime glass. This change made the dishes more susceptible to thermal shock, leading to reports of them spontaneously shattering or exploding when exposed to sudden temperature changes.
The Seven Ultra Rare Sea Glass Colors
1956 – The first screen-printed patterns debuted in Pink Daisy and Snowflake, which came in white on turquoise, turquoise on white, and white on charcoal. 1952 – Lime and Flamingo Pink joined the Pyrex Primary Colors.
Colonial Mist was produced from 1983 to 1986, and it has the distinction of being the last opal Pyrex pattern ever designed before production ceased in 1986.
The "good" Pyrex is vintage glassware featuring the uppercase PYREX logo. Made from borosilicate glass, it can handle extreme temperature changes (thermal shock). Modern glassware has a lowercase pyrex logo. Made of tempered soda-lime glass, it is more prone to shattering from sudden temperature shifts.