AI Appraisal Estimate

This is a mid-century vintage footed drinking vessel, often referred to as a tumbler or water goblet, manufactured in a rich honey-toned amber pressed glass. The item features the 'Prism' pattern, characterized by a bold, geometric stack of faceted octagonal modules that create a heavy textured exterior. These deep-cut geometric shapes provide a prismatic effect when light passes through the thick glass. The vessel expands slightly from a narrow base toward a wide, smooth-rimmed mouth. It is supported by a short, integrated pedestal stem and a circular, slightly domed foot. Physically, the piece appears to be made of heavy-weight soda-lime glass, standing approximately 5 to 6 inches tall. The color is consistent throughout, showing deep golden and yellowish-brown hues typical of amberware from the 1960s and 1970s. Regarding condition, the glass retains a bright luster with no immediate visible cracks or large chips; however, there is typical shelf wear on the bottom of the base and some minor air bubbles (seeds) inherent in the pressing process. No maker's marks are visible on the base in this view, which is common for Libbey glassware of this era. The craftsmanship is robust and utilitarian, representing the mass-produced Mid-Century Modern aesthetic that prioritized geometric regularity.

I have virtually examined this Libbey Amber Glass 'Prism' pattern tumbler and find it to be a classic example of American mass-produced glassware from the 1960s-1970s. The piece exhibits the characteristic geometric 'Prism' texture and the specific 'honey' amber hue associated with Libbey’s mid-century catalogs. Upon visual inspection, the luster remains high, suggesting no significant etching or 'dishwasher rot.' The identified seeds and shelf wear are consistent with the manufacturing standards and age of soda-lime glass of this era. Market demand for isolated amber tumblers is currently moderate, driven primarily by the Mid-Century Modern (MCM) home decor trend. Comparables for single units typically fall in the $10-$18 range at retail; however, value is significantly higher when sold as a cohesive set of 4, 6, or 8. The lack of a 'script L' mark is typical for this line and does not detract from its status as a vintage utilitarian object. Limitation of this appraisal: While the image suggests high-quality condition, a physical examination is required to detect microscopic 'flea bites' along the faceted edges or internal stress fractures. Full authentication of Libbey origin relies on comparison with archival catalog specifications (Pattern #5107). No scientific testing is required for this class of glassware, but provenance regarding the original purchase would further confirm its age.