I'm not as well versed as many on the scarcity of these, but do know they are extremely rare; this one possibly being UNIQUE. This has a distinctive two tone quality; one side being lighter in shade than the other. Possibly found in an area where the UV was inhibited from striking the one side. There is very shallow base rim flaking as seen in photo 3, "chatter". It displays great as these are not apparent when sitting on a shelf. Other than this, exceptional condition. Asking $4,000