How to Date CorningWare? A Guide to Identifying Your Vintage Treasures
Dating CorningWare involves examining the backstamp, design and shape of your pieces to determine their approximate year of manufacture. Key indicators include the wording of the backstamp, the presence of a trademark symbol, and the specific pattern or color scheme.
A Timeless Treasure: The Enduring Appeal of CorningWare
CorningWare. The name alone conjures images of cozy kitchens and family dinners. More than just cookware, these durable and versatile dishes hold a special place in the hearts (and homes) of many. But beyond their practical use, vintage CorningWare pieces are also increasingly sought after by collectors. So, how do you uncover the history hidden within your own casserole dishes? Dating your CorningWare allows you to understand its origins, appreciate its value, and perhaps even discover a rare or highly coveted piece. This guide will provide you with the knowledge and tools to confidently date your CorningWare collection.
The Anatomy of a CorningWare Backstamp
The backstamp, located on the bottom of each CorningWare piece, is your primary source of information for dating purposes. These markings contain valuable clues about the manufacturer, the pattern, and the approximate year of production.
- Manufacturer Information: Look for “Corning Glass Works,” “Corning Glass Works, Corning, NY, USA,” or simply “Corning.” The specific wording changed over time.
- Pattern Name (sometimes): Some backstamps include the pattern name, such as “Spice o’ Life” or “Blue Cornflower.”
- Trademark Symbols: The presence (or absence) of the ® symbol is crucial. Its introduction and placement evolved.
- Production Codes: These are less common but may indicate a specific manufacturing date or batch.
Deciphering the CorningWare Pattern
The pattern on your CorningWare can be a strong indicator of its age. Certain patterns were only produced for a limited time, allowing you to narrow down the dating significantly.
- “Blue Cornflower”: One of the most iconic and widely produced patterns, it debuted in 1957 and remained in production for decades. Changes in the flower design or coloration can help pinpoint the era.
- “Spice o’ Life”: Introduced in 1972, featuring artichokes, mushrooms, and tomatoes. It’s a popular pattern easily identified.
- “Wildflower”: Introduced in 1977, featuring a floral design.
- Limited-Edition Patterns: Research these patterns meticulously to identify the production period. Some patterns were only available for a year or two. Check online databases and collector guides for details.
Shape Shifters: Understanding CorningWare Styles
The shape of your CorningWare dish can also provide hints about its age. Early pieces often featured simpler, more classic designs, while later pieces incorporated more modern or decorative elements.
- Early Shapes: Casserole dishes with straight sides and simple handles were common in the early years.
- Later Shapes: More elaborate designs with fluted edges, scalloped sides, or decorative lids appeared later.
- Specialty Pieces: Consider the specific function of the piece. Baking dishes, serving platters, and teapots were introduced at different times.
Trademark Tales: The Evolution of the ® Symbol
The presence and placement of the registered trademark (®) symbol is a key indicator of dating.
- Early Pieces (pre-1960s): Might lack the ® symbol altogether.
- Later Pieces (1960s onward): Usually feature the ® symbol near the CorningWare logo or pattern name.
- Location Variation: Pay attention to the position of the ® relative to the other text in the backstamp.
A Table of CorningWare Clues:
| Feature | Early (1950s-1960s) | Mid (1970s-1980s) | Late (1990s-Present) |
|---|---|---|---|
| Backstamp Text | “Corning Glass Works” | “Corning Glass Works, Corning, NY, USA” | “Corning” |
| Trademark Symbol | Often absent | Present and clearly visible | May be smaller or less prominent |
| Pattern Examples | Blue Cornflower (early iterations) | Spice o’ Life, Wildflower | More modern patterns, often microwave-safe |
| Shape | Simple, straight-sided casseroles | More decorative designs | Focus on convenience and modern kitchens |
Common Dating Mistakes to Avoid
- Assuming all Blue Cornflower is old: The pattern was produced for decades, so variations in the design and backstamp are crucial.
- Ignoring the backstamp: The backstamp is the most reliable source of information.
- Relying solely on pattern name: Many patterns were re-introduced or had variations over time.
- Overestimating value: Age doesn’t always equal high value. Condition and rarity also play a significant role.
Frequently Asked Questions (FAQs)
What is the most valuable CorningWare pattern?
While value is subjective and market-dependent, rarer patterns and pieces in excellent condition tend to command higher prices. Certain limited-edition designs or pieces with unique features are often sought after by collectors.
Where can I find reliable information about CorningWare patterns?
Several resources can help you identify CorningWare patterns. Online collector communities, specialized websites, and books dedicated to vintage cookware are valuable resources. Consider checking eBay completed listings for sales history of similar items.
How do I clean vintage CorningWare without damaging it?
Gentle cleaning is key. Avoid abrasive cleaners or harsh scrubbing pads, which can scratch the surface. Warm, soapy water and a soft cloth are usually sufficient. For stubborn stains, try a paste of baking soda and water.
What does it mean if my CorningWare has a “P” number?
The “P” number is a product code. It doesn’t directly indicate the date of manufacture but can be helpful when researching a specific pattern or piece in conjunction with other identifying features.
Is all CorningWare oven-safe?
Most vintage CorningWare is oven-safe, but it’s always best to exercise caution. Avoid extreme temperature changes, such as taking a cold dish directly from the refrigerator to a hot oven. Modern CorningWare products may have different heat tolerances, so always check the manufacturer’s instructions.
How can I tell if my CorningWare is genuine?
Look for the CorningWare name and logo clearly marked on the backstamp. Be wary of pieces with misspelled names or poorly executed designs. Researching specific patterns can also help you identify any inconsistencies or red flags.
What is pyroceram, and how does it relate to CorningWare?
Pyroceram is the unique glass-ceramic material that makes CorningWare so durable and heat-resistant. It was developed by Corning Glass Works in the 1950s. This material allows CorningWare to withstand extreme temperatures without cracking or shattering.
Are there any specific patterns that are particularly rare or hard to find?
Yes, several patterns are considered rarer and more collectible. These include “Black Starburst”, “French White” (certain early pieces), and some of the limited-edition promotional patterns. Market demand influences value, so research is key.
Does the color of the Blue Cornflower pattern indicate age?
Yes, the intensity and shade of blue in the Blue Cornflower pattern can provide clues to its age. Early versions tended to have a deeper, richer blue, while later versions may have a lighter or more faded appearance.
What is the best way to store CorningWare to prevent damage?
Stack CorningWare carefully to avoid scratching or chipping. Consider using felt pads or dish protectors between pieces. Store in a dry location to prevent moisture damage.
Where was CorningWare primarily manufactured?
CorningWare was primarily manufactured in the United States, specifically in Corning, New York. However, production later expanded to other locations as well.
How did the change in CorningWare ownership impact the dishes?
Changes in ownership, particularly the sale of the CorningWare brand, sometimes resulted in changes to the materials, manufacturing processes and pattern designs. Vintage CorningWare often has different properties than contemporary versions.