AI Appraisal Estimate

This item is a semi-circular or crescent-shaped bowl constructed from what appears to be heavy clear glass or lead crystal. The design is stylistically consistent with the Art Deco or Streamline Moderne period, featuring repetitive linear geometric motifs. Four horizontal frosted bands wrap around the exterior, terminating in a stepped, notched architectural detail at the sides. The base is thick and rounded, providing stability to the unusual profile. The glass exhibits a high degree of transparency in the polished sections, which is consistent with quality 20th-century decorative glassware. There are no maker's marks, signatures, or acid-etched labels visible in the provided image; therefore, the attribution to a specific glasshouse remains a hypothesis subject to physical inspection. This design is consistent with works produced by companies such as Steuben or Verlys during the mid-20th century. Condition-wise, the bowl shows some visible shelf wear on the underside and surface reflections that may obscure minor scratches. A small irregularity or possible nick is visible along the upper right interior rim, though this may be a reflection or a minor manufacturing artifact. Without a visible hallmark, the identification is based strictly on stylistic and material characteristics.

I have examined the images of this semi-circular glass bowl featuring repetitive linear geometric motifs and frosted bands. Based on the stylistic evidence, I am treating the attribution to a prestige maker like Steuben or Verlys as a hypothesis only. From what I can see, the quality of the glass and the precision of the frosted bands suggest a mid-20th-century origin, but I cannot verify the exact manufacturer or the lead content of the crystal without a physical inspection. The value estimate of $150–$400 is based on the assumption that the piece is a period-correct, high-quality production consistent with the Art Deco aesthetic. If this attribution to a major glasshouse were proven via a newly discovered acid-etched mark or documented provenance, the value would likely sit at the higher end of the range. Conversely, if the item is later identified as a modern reproduction or a less prestigious 'in the style of' piece, the market value would typically decrease to $50–$100. Verification of the small irregularity on the rim is also necessary, as chips significantly impact the value of decorative glassware. To reach a more certain valuation, an expert would need to perform a tactile examination to check for signature remnants, measure the light refraction, and analyze the specific wear patterns on the base. Currently, the market for streamline decorative glass remains stable among collectors of Mid-Century and Art Deco decor, though prices fluctuate based on brand recognition and condition.