Blenko Glass Air Twist Spiral Hand Blown Paperweight Vintage Mid 20th Century

This is a fabulous peice of art history. This spiral design was produced in the mid 20th century. The blue color is fabulous. There are bubbles within the glass that are naturaly occurring during the production process. Sadly, there is a shallow nick on one side of the paperweight. See last photo. Approx 4 inches tall and very heavy. Thank you