Ok first let me say I have no knowledge on this piece so I am going to describe what I'm seeing and please view all photos carefully and come to your own conclusion prior to bidding. This is a large 16" diameter and approx 4" deep fluted glass centerpiece bowl (I am assuming) or possibly sink bowl? with a textured appearance there are no artist makers markings. It also casts a big intricate pattern under different lighting and it was hard to capture the true beauty of the reflection. The color of this is a brilliant aqua blue flash , looks like color was flashed onto the clear piece as from use there are some wear rubs on bottom rim of bowl  and light scratches that show as clear as you see in ruby flash pieces. There is a hole drilled into the bottom as if for some sort of drain and it has a rubber stopper that could use a better fit don't know if it was produced this way or added later.  All items sold "as is" please ask any and all questions or request additional photos prior to bidding as I do not accept returns refunds on antique/ vintage/ used items.  Any and all claims for shipping damages are to be made by buyer thru appropriate shipping carrier not thru myself or Ebay.