Set of seven vintage studio glass square vases or candle holders stamped by World Glass Makers Union

These square-profile studio glass pieces represent a collaborative effort by the World Glass Makers Union, an organization that brought together skilled artisans to create quality glassware during the mid-to-late 20th century. The union stamp indicates these are not mass-produced commercial items but rather studio-crafted pieces made by member artisans. Such marked pieces were produced in limited quantities and distributed through specialized channels, making them more collectible than unmarked commercial glassware. These stamped studio glass pieces appeal to collectors of vintage studio glass, art glass enthusiasts, and those interested in guild-marked or union-produced decorative arts. The presence of the World Glass Makers Union stamp adds provenance and authenticity, elevating these pieces above typical commercial glassware. Collectors value such marked pieces for their documented maker attribution and the craftsmanship associated with union-produced studio glass from this era.