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Controlled Bubble Worthy Of The Crown Rocks Glasses Set Of 3 Heavy Barware:
$19.50
These heavy-based rocks glasses, commonly known as bubble bottom or controlled bubble barware, are likely vintage pieces from the mid-to-late 20th century.
Identification and Potential Brands
Glasses with a single large air bubble suspended in a heavy clear base were produced by several notable manufacturers:
- Krosno (Poland): A very common manufacturer for this style. Their 1970s mouth-blown crystal pieces often featured a single suspended bubble and are known for their substantial weight.
- Libbey: Produced the "Nob Hill" pattern which features a bubble in the base. These are frequently found in "Ice Blue" or clear glass.
- Bormioli Rocco (Italy): Produced "controlled bubble" glasses similar to these, often with a slightly different silhouette or multiple smaller bubbles.
Key Features Observed
- Weighted Base: The thick bottom adds stability and a premium feel, with individual glasses often weighing over a pound.
- Controlled Bubble: This is an intentional decorative feature created during the glass-blowing process by trapping a precise amount of air.
- Condition Indicators: Small imperfections like tiny air "seeds" or faint surface scratches (straw marks) are typical for authentic vintage glass and indicate they were likely hand-blown or early machine-pressed.
