Trio of stoneware hot water bottles

Set of 3 hot water bottles or vintage stoneware bottles. They measure between 29 and 30 cm. The thinnest has an inscription at the bottom (100 centiliters) and is signed pont des vernes france, the other very heavy has a porcelain cap and finally the last one is stamped in the mass: fabrique dumontet. For a bohemian decoration in a kitchen for example.