How can you tell vintage Blenko?

To tell vintage Blenko, conduct research using trusted online resources to try and date your piece. To be considered vintage, Blenko glassware must be between 20 and 99 years old. Pieces that are at least 100 years old are antiques. Because many Blenko pieces are unmarked, the best way to identify them is by examining their physical characteristics, such as color, shape and style. Looking through the maker's catalogues — available to browse online — can give you an idea of your glassware's approximate production year. Alternatively, you can have a certified appraiser or knowledgeable antique dealer perform the dating process. Find a collection of Blenko glass on 1stDibs.