Vintage 1930’s? Delphin Porcelain/Stone Water Filter

Vintage 1930’s? Delphin Water Filter “The Delphin Filter Company was founded in 1905 near Vienna Austria. They offered a wide range of products including fine pour filters made of burnt artificial stone that came in different shapes and sizes. They claimed to guarantee germ free water.” It was placed empty in water up to its neck, and it filled itself with filtered water.
Black and White glazed upper part. Unglazed lower section. Small chip on lip of jar. See pics for other small marks. Very good condition Measurements: Height: 12.25” Diameter 15.25-15.75” Own a piece of history.!! You can sign up to Poshmark and use the code katiekoos_usa for a discount😊