Agreed. Same thought. They came in alot of styles and square with paper label is probably what Warf Rat has and the label has just disintegrated with time. Check the bottom for numbers to be sure, quite certain CrownP bottles had a diamond logo on the bottom as well.It reminds me of those Crown Perfumery bottles, which contained lavender salts (a sort of 19th century air freshener, apparently). So I'm guessing yours likely held something similar, and dates to the 1890s-1910s or so.