Vintage Corning Ware Cornflower Blue Casserole Dish with P-7-C Lid

This is a vintage Corning Ware square casserole dish featuring the iconic 'Cornflower Blue' pattern, which consists of three blue flowers with green leaves on a solid white background. The piece is manufactured from Pyroceram, a high-durability glass-ceramic material designed to withstand extreme temperature changes from freezer to oven or stovetop. The dish includes small integrated tab handles extending from the rim. It is accompanied by a transparent Pyrex glass lid (likely a P-7-C model) with a centralized round knob handle and deep concentric rings. The lid shows visible amber-colored staining or baked-on grease residue along the inner rim, indicative of previous use and age. The white body appears to be in relatively good condition with the blue floral graphic retaining its color, though close inspection of the rim suggests minor utensil marks. This specific pattern was the first produced by Corning Ware, introduced in 1958 and becoming a staple of mid-century American kitchens. The craftsmanship is characterized by its heavy, dense feel and the smooth, non-porous finish of the Pyroceram material. The overall condition is good for a utilitarian kitchen item of this period, though the lid requires deep cleaning to restore optical clarity.

Based on my visual examination of this vintage Corning Ware 'Cornflower Blue' casserole dish, I have determined it to be a genuine mid-century piece manufactured from Pyroceram. Historically, the Cornflower Blue pattern (introduced in 1958) is highly recognizable; however, its mass production for several decades impacts its rarity. My assessment shows the handle tabs and floral graphic are consistent with authentic pre-1970s production. The body displays good luster, but the P-7-C lid exhibits significant amber staining (carbonized grease) that requires professional cleaning to restore value. Market conditions for Corning Ware currently reflect a divide: while common pieces like this are plentiful, the demand remains steady for functional kitchen use and nostalgic collections. Recent sales for this specific size and condition range between $35 and $65, though pristine specimens with original boxes can fetch a premium. A significant limiting factor is the lid's condition, which detracts from the 'display' quality. Please note that an appraisal from images alone cannot confirm the absence of 'flea bites' (tiny chips along the rim) or hairline fractures within the Pyroceram. To fully authenticate and refine this valuation, I would require an in-person physical inspection to verify the backstamp markings (which clarify the specific production year) and a tactile check for structural integrity. No provenance was provided, but high-value collectors would prioritize pieces with documented history or those verified as 'first-run' production from the late 1950s.