AI Appraisal Estimate

This is a classic 1-cup (8 oz / 250 ml) measuring cup manufactured by Pyrex, composed of thick, heavy-duty borosilicate or soda-lime tempered glass. The vessel features a cylindrical form that tapers slightly toward the base, an integrated pouring spout, and an arched D-shaped handle designed for ergonomic grip. The exterior is adorned with distinctive red baked-on enamel markings. The primary face displays '1 CUP' and '8 oz' graduation scales, with 'PYREX®' written vertically between them. Opposite this, a metric scale is visible. Based on the blocked lettering style and the positioning of the registered trademark symbol, this piece likely dates from the late 20th century, approximately the 1970s to the 1990s. The glass exhibits a high level of transparency, though there is visible 'dishwasher haze' or clouding and light mineral buildup at the bottom. The red lettering shows minor 'dishwasher fade' and slight abrasions, typical for a utilitarian kitchen item of this age. There are no large chips or structural cracks visible, though minor surface scratches are present from years of nesting and use. The thick-walled construction remains a hallmark of Pyrex craftsmanship, intended for thermal shock resistance.

Based on my examination of this vintage 1-cup Pyrex measuring vessel, I have identified it as a standard utilitarian piece likely produced between the late 1970s and 1990s. The vertical orientation of the 'PYREX®' logo and the use of block lettering are consistent with mass-produced kitchenware from the Corning Glass Works/World Kitchen transition era. The item exhibits signs of 'dishwasher haze' (etching) and mineral deposits, which significantly impact the clarity and aesthetic appeal of the glass. The minor fading and abrasions on the red enamel markings further indicate a life of frequent domestic use rather than a preserved collector's state. The market for vintage Pyrex remains robust, but demand is heavily concentrated on limited-edition opalware patterns (e.g., Pink Daisy or Butterprint) rather than clear graduated measuring cups. Because millions of these units were manufactured, they remain common in the secondary market (thrift stores, estate sales, and online marketplaces). The current value is driven by functionality rather than rarity. Limitations: My assessment is based on visual data. A physical inspection would be required to rule out 'flea bites' (micro-chips) along the rim and spout that can be felt but not seen. Furthermore, I cannot definitively determine if this is borosilicate or the later soda-lime glass without testing its thermal expansion properties or refractive index. Full authentication of the production era would require cross-referencing factory mold numbers located on the base, which were not fully visible in the provided images. Provenance documentation is not applicable for this mass-market item.