Day 404-Charcoal Large Diamond Optic
Here is an example of the Large Diamond Optic water bottle in Charcoal. Any LARGE Diamond optic water bottles that I have seen were marked 2010 on the base and this is no exception. Blenko experimented with three types of optic water bottles but narrowed it down to the two current patterns and as far as I know has not made the large diamond optic in water bottles again. They still have the mold that imprints the large diamond pattern into the glass so the possibility of more of these large diamond water bottles being made does exist.