Blenko Glass Crystal Bicentennial Etched Mug. Item # VB-1. Designed by Don Shepherd in 1976. The U.S. Bicentennial Society appointed Blenko Glass Company as its authorized manufacturer of blown glass products. The mug has the Bicentennial Hallmark of Quality etched eagles and the golden seal. The foil Blenko sticker is also attached.The pontil mark is ground and polished. It is 5 inches tall and about 4 1/2 inches in diameter at the widest. There are no chips, cracks, or other issues.