This one has me stumped. (Not hard to do) It looks about the size of a small ink, and stands just 2 1/4 tall, but the odd opening shape has me scratching my head. It has a seam around the base, and two two coming up the sides clear to the top of the lip. No markings. The opening is smaller than I think I might expect. My best guess is an eye wash???? Your Thoughts...Who, what, where, when?? As always THANKS!!!