There are maybe 5-6 known examples of a 16660 matte dial co branded with Tiffany and Co  and this one is MINT -   The dial and hands are flawless with clear Tiffany & CO text. and the lume has aged to a nice warm pumpkin hue.  The case was polished in the past however remains thick and even.  The bezel is sharp and the insert is in great shape.  There are a few nicks around the side of the crystal.  The bracelet is fully linked and tight and the buckle looks like as if it was repaired at some point in the past. The movement is running flawlessly. No box or papers on this one.