I recently acquired this pair of art glass "tumblers" (if that's what they are) at an auction where they were represented as being made by Blenko. I was hoping that someone could help me confirm this and provide some additional information. Specifically, I was wondering if a collector could help me determine what years this design was made and who the designer was (if known). If you can help me with the official color name, that would be helpful too.
Each of the tumblers measures about 4" tall and 4 3/8" wide. I also provided a closeup of the pontil (last photo), if that helps any.
Thanks in advance!