Blenko Glass Pair of #4 Turquoise Water Glasses Tumblers. This is the 4th design added to the Blenko line when tableware was started in the 1930's. This design was offered in the catalogs in the 1930's and early 1940's. The color is the deep, rich turquoise color found during Blenko's early years. The glasses are about 4 3/4 inches tall, 3 1/4 inches across the top, and 2 1/2 inches in diameter at the foot. The pontils mark are rough. There are some small, light scratches on one glass and shelf wear on the bottoms. There are no chips, cracks, or water damage.