This substantial hand-formed glass sculpture commandingly interacts with light through its deeply saturated cobalt core and high-clarity crystal casing. The form is defined by sweeping, asymmetric rim articulations that create a sense of arrested motion, moving beyond functional vessel logic into pure sculptural expression. Under 365nm UV light, the outer casing reveals a vibrant neon-green fluorescence, indicating the presence of uranium oxide—a technical characteristic that adds a hidden, secondary dimension to its visual profile.
Attribution & Period
1960s. The technical execution—specifically the heavy "sommerso" style casing and the inclusion of UV-reactive agents—is stylistically aligned with mid-century Bohemian and Scandinavian studio traditions. The deliberate weighting of the base and the precision of the internal color suspension suggest a high-level production house, likely from the Zelezny Brod (ZBS) or Sklo Union regions, where experimental glass chemistry and organic "free-form" shaping were hallmarks of the era.
Dimensions & Weight
Height: 8 1/4 inches
Width: 6 inches
Depth: 3 1/2 inches
Weight: 3.362 lbs
Condition
Excellent vintage condition. The glass remains remarkably clear with no chips, cracks, or flea bites to the delicate rim. Minor surface shelf wear is restricted to the underside of the base, consistent with age and authentic handling.
Authenticity & Construction
This piece is a testament to advanced hot-working control, featuring a cased glass technique where the cobalt interior is submerged into a thick gather of uranium-infused crystal. The presence of subtle concentric working marks and internal lensing at the base confirms a hand-formed process. Unlike mass-produced pressed glass, the varying thickness of the walls creates complex prismatic effects and a sophisticated optical depth.
Placement
With its dual-tone profile and dramatic silhouette, this sculpture is ideally suited for a lit pedestal, a modernist console, or as a centerpiece in a curated glass collection. Its reactive properties make it a compelling "discovery" piece for interiors utilizing varied lighting schemes.
STANDARD ATTRIBUTION & VALUE DISCLOSURE
This piece is described to the best of current scholarly and market knowledge. Any maker or regional attribution is based on visual analysis, materials, construction techniques, and documented stylistic comparisons. As with many MCM and antique design objects, definitive attribution may not be possible without original labels or factory records. Pricing reflects condition, quality, decorative appeal, and current collector demand rather than guaranteed maker identification.
CERTIFICATE OF AUTHENTICITY & PROVENANCE REPORT
Reference Number: G-1960-CB-0824
Object Classification: Sculptural Art Glass
Period: Mid-Century Modern (Circa 1960–1969)
Material Composition: Cased Lead Crystal with Cobalt Oxide Core and Uranium Oxide Outer Gather
OBJECT DESCRIPTION & ANALYSIS
This masterwork of mid-century glassmaking is a sophisticated example of the Sommerso technique, characterized by a deep, light-absorbing cobalt interior suspended within a heavy, high-clarity crystal casing. The form is defined by an aggressive, free-form rim treatment that prioritizes sculptural silhouette over utilitarian function.
Of particular note to the collector is the rare inclusion of uranium oxide within the clear casing. While appearing colorless under natural daylight, the material exhibits a vibrant neon-green fluorescence under 365nm UV light. This dual-state characteristic identifies the piece as a product of advanced chemical experimentation common in high-end European studios during the 1960s.
TECHNICAL SPECIFICATIONS
• Method: Hand-formed, hand-tooled glass (unmarked)
• Dimensions: 8 1/4" H × 6" W
• Weight: 3.362 lbs
• Reactive Profile: 365nm UV Positive (High Luminance)
ATTRIBUTION & CURATORIAL CONTEXT
The sculptural language—specifically the interplay between the optically heavy base and the fluid, asymmetric "wings"—is stylistically aligned with the works of the Zelezny Brod (ZBS) glassworks in the former Czechoslovakia. The tension between the weighted mass and the delicate, hand-pulled rim suggests a master-level blower. The absence of a factory mark is consistent with period studio exports intended for high-end boutique markets in the United Kingdom and North America.
CONDITION SUMMARY
The specimen is in Exhibition Grade condition. No chips, fractures, or internal clouding are present. The integrity of the glass remains pristine, with only negligible surface micro-scratches on the underside of the base, verifying its authentic age and shelf-life.
VALUATION RATIONALE
The valuation of $1,250 USD reflects the specimen’s exceptional physical mass, the technical complexity of the uranium-cased layering, and the current market demand for "discovery" pieces that offer interactive light elements within a minimalist modernist framework.
Statement of Authenticity
This document serves as a formal record of the object’s characteristics and market position at the time of listing. All descriptions are based on professional visual analysis, material testing (UV), and comparative stylistic research within the field of 20th-century decorative arts.
This substantial hand-formed glass sculpture commandingly interacts with light through its deeply saturated cobalt core and high-clarity crystal casing. The form is defined by sweeping, asymmetric rim articulations that create a sense of arrested motion, moving beyond functional vessel logic into pure sculptural expression. Under 365nm UV light, the outer casing reveals a vibrant neon-green fluorescence, indicating the presence of uranium oxide—a technical characteristic that adds a hidden, secondary dimension to its visual profile.
Attribution & Period
1960s. The technical execution—specifically the heavy "sommerso" style casing and the inclusion of UV-reactive agents—is stylistically aligned with mid-century Bohemian and Scandinavian studio traditions. The deliberate weighting of the base and the precision of the internal color suspension suggest a high-level production house, likely from the Zelezny Brod (ZBS) or Sklo Union regions, where experimental glass chemistry and organic "free-form" shaping were hallmarks of the era.
Dimensions & Weight
Height: 8 1/4 inches
Width: 6 inches
Depth: 3 1/2 inches
Weight: 3.362 lbs
Condition
Excellent vintage condition. The glass remains remarkably clear with no chips, cracks, or flea bites to the delicate rim. Minor surface shelf wear is restricted to the underside of the base, consistent with age and authentic handling.
Authenticity & Construction
This piece is a testament to advanced hot-working control, featuring a cased glass technique where the cobalt interior is submerged into a thick gather of uranium-infused crystal. The presence of subtle concentric working marks and internal lensing at the base confirms a hand-formed process. Unlike mass-produced pressed glass, the varying thickness of the walls creates complex prismatic effects and a sophisticated optical depth.
Placement
With its dual-tone profile and dramatic silhouette, this sculpture is ideally suited for a lit pedestal, a modernist console, or as a centerpiece in a curated glass collection. Its reactive properties make it a compelling "discovery" piece for interiors utilizing varied lighting schemes.
STANDARD ATTRIBUTION & VALUE DISCLOSURE
This piece is described to the best of current scholarly and market knowledge. Any maker or regional attribution is based on visual analysis, materials, construction techniques, and documented stylistic comparisons. As with many MCM and antique design objects, definitive attribution may not be possible without original labels or factory records. Pricing reflects condition, quality, decorative appeal, and current collector demand rather than guaranteed maker identification.
CERTIFICATE OF AUTHENTICITY & PROVENANCE REPORT
Reference Number: G-1960-CB-0824
Object Classification: Sculptural Art Glass
Period: Mid-Century Modern (Circa 1960–1969)
Material Composition: Cased Lead Crystal with Cobalt Oxide Core and Uranium Oxide Outer Gather
OBJECT DESCRIPTION & ANALYSIS
This masterwork of mid-century glassmaking is a sophisticated example of the Sommerso technique, characterized by a deep, light-absorbing cobalt interior suspended within a heavy, high-clarity crystal casing. The form is defined by an aggressive, free-form rim treatment that prioritizes sculptural silhouette over utilitarian function.
Of particular note to the collector is the rare inclusion of uranium oxide within the clear casing. While appearing colorless under natural daylight, the material exhibits a vibrant neon-green fluorescence under 365nm UV light. This dual-state characteristic identifies the piece as a product of advanced chemical experimentation common in high-end European studios during the 1960s.
TECHNICAL SPECIFICATIONS
• Method: Hand-formed, hand-tooled glass (unmarked)
• Dimensions: 8 1/4" H × 6" W
• Weight: 3.362 lbs
• Reactive Profile: 365nm UV Positive (High Luminance)
ATTRIBUTION & CURATORIAL CONTEXT
The sculptural language—specifically the interplay between the optically heavy base and the fluid, asymmetric "wings"—is stylistically aligned with the works of the Zelezny Brod (ZBS) glassworks in the former Czechoslovakia. The tension between the weighted mass and the delicate, hand-pulled rim suggests a master-level blower. The absence of a factory mark is consistent with period studio exports intended for high-end boutique markets in the United Kingdom and North America.
CONDITION SUMMARY
The specimen is in Exhibition Grade condition. No chips, fractures, or internal clouding are present. The integrity of the glass remains pristine, with only negligible surface micro-scratches on the underside of the base, verifying its authentic age and shelf-life.
VALUATION RATIONALE
The valuation of $1,250 USD reflects the specimen’s exceptional physical mass, the technical complexity of the uranium-cased layering, and the current market demand for "discovery" pieces that offer interactive light elements within a minimalist modernist framework.
Statement of Authenticity
This document serves as a formal record of the object’s characteristics and market position at the time of listing. All descriptions are based on professional visual analysis, material testing (UV), and comparative stylistic research within the field of 20th-century decorative arts.
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