Blenko Glass Olive Green Mug. This mug doesn't have a catalog number, but appears to have been made in the 1960's or 1970's. It is 4 1/2 inches tall, 3 3/4 inches in diameter at the bottom, and 4 1/4 inches in diameter at the top. There are no chips, cracks, or water damage. The pontil mark is fire polished.