Hi ,i have only recently realized that there is an interest in this glass, i used to do a little electrical work at the Tipton factory in the late eighties, and there was a factory shop on site where i used to purchase pieces, some seconds , every time i went there, so i have ended up with about 20 pieces . The one desribed with a fold in it is the same as one i have ,also with a small fold in it, only white in colour. I remember lots of colours available , from almost clear to deep blue .almost black. I got so taken by the style that i even to take my other half and our daughter there to chose pieces now and again . These Studio pieces were made in molds , i know this as i saw this being done as i worked on the ovens/kilns being used, and also the lighting section in the same factory. I also had family and friends at the time who worked at the factory.