These came out of our mid-century bathroom. The brand is Stylon USA and I'm not sure of the official color name but they are light blue, maybe periwinkle?
I have cleaned most of them but not all.
4"x4" regular- 190 clean tiles and 77 that need cleaning
4"x4" bullnose- 1 clean tile
4"x4" corner bullnose- 1 clean tile
6"x2" bullnose- 32 clean tiles
There is also assorted scrap pieces that need to be cleaned.