This is a blue glass rondel, a flat, circular piece of pressed glass often used in stained glass art.
Specifications
- Material: It is made of blue-tinted glass.
- Shape: The base is circular with a concaved punt (indentation).
- Markings: There is a molded symbol in the center of the punt, which might be a manufacturer's mark or a recycling symbol, but it is not clear enough to identify precisely.
- Texture: The outer edge of the base has a textured, possibly stippled or patterned, rim.
