Vintage Pyrex Glass Bakeware Fragment

This item is a fragment of vintage Pyrex bakeware, identifiable by the embossed 'PYREX' trademark visible in the clear borosilicate or lime-soda glass. The material is thick, transparent glass with a slight yellowish or greenish tint characteristic of older glass formulations. The embossed lettering is in a san-serif block font, a hallmark of mid-to-late 20th-century production by Corning Glass Works. Physically, the glass exhibits significant surface wear, including numerous fine scratches, scuffs, and small internal abrasions which comprise a 'frosted' look in certain light. There are visible linear scratches and some organic particulate buildup on the surface, typical of high-frequency domestic use in kitchens. The edge profile suggests a rim or a handle of a larger vessel, such as a casserole dish or a measuring cup. The craftsmanship is industrial-grade, designed for thermal shock resistance and durability. Despite the heavy surface wear and lack of structural completeness, the branding remains legible, marking it as a piece of American culinary history likely dating between the 1940s and 1980s.