Unknown Glass Manufacturers

The Unknown category of antique and vintage glassware presents a unique challenge for collectors and enthusiasts due to the lack of definitive markings and hallmarks. Unlike some collectibles, not all glassware from the mid-19th to mid-20th century was identified with specific manufacturer markings, making it harder to attribute pieces to specific companies.

This mystery adds an intriguing element to the search for and acquisition of vintage glassware, as numerous companies emerged and shutdown after brief periods in the production and decoration of glassware during this period.

The art of engraving, in particular, played a significant role in enhancing the beauty and value of these pieces, with many shops involved, further complicating the task of tracing their origins.

Despite the uncertainties surrounding the origins of these items it's possible to attribute Unknown glassware to specific periods based on designs and other characteristics that include whether the glass 
fluoresces under UV light (yes, even clear glass that is older will flouresce green under UV), whether there are imperfections in the glass such as bubbles, etc.