So many years ago, when I was in art school, there was a junk store which sold anything but junk, on Canal Street in NYC. I used to love to go in there and search for hours. They had many small white porcelain "thimbles" with hundreds of holes at the bottom which was like a strainer. This was my first introduction to Coors.
Before 1918, porcelain chemical and labware was imported from Germany for laboratory research. Once it became impossible to import from Germany, an American ceramics company began to make quality and consistent porcelain for the laboratory
This is Coors, and is pretty easy to find. The company continues to manufacture, but I like finding them in antique shops and flea markets, tucked away in unlikely spots. You can tell it is made from the Coors factory by its small green logo near the rim.