When I first purchased this water bottle, I did not know what color it was. I studied the different colors that it could be and tentatively decided that it was cased Aqua. As I was cleaning the bottles prior to photographing for this blog it finally dawned on me that it was one of the Charcoal pieces from 1961 and 1962. A closer inspection shows that it gets lighter and is actually clear near the bottom but it does not have the tell tale Crystal base that you would expect of a cased piece.
With this posting I have actually fulfilled my promise to give you 366 unique water bottles, (A YEAR of BLENKO WATER BOTTLES.) Do not think this is the end. One generous water bottle collector has provided photos of a portion of their collection for me to share with you.