RARE Green Polyflon Mid Century Modern MCM  Insulated Ice Bucket

I can not find anything like this on the Internet. My guess this was a prototype for a line theta was never produced. There is a plastics manufacturer named polyflon that has been in business since the 1950s. 

The lid has 3 spires that meet at the center. The metal handle moves freely. 

There is a slight taper to the cooler.