De Denbac art-deco pitcher in flamed sandstone signed around 1910/40 SB

Here is from denbac a beautiful art deco pitcher in flamed sandstone, signed below. Period: around 1910-1940. Condition: set in very nice condition, no crack or repair, as in the photos. Dimensions: height: 24.5 cm, diameter: 13 cm. Package: about 1.3 kg. Denbac is the trademark of rené denert and rené-louis balichon. Created in 1908 in vierzon, it produced and marketed a sandstone production of tableware, decorative and advertising objects. In 1937, on the death of rené denert, the activity declined, then suspended during the second world war. It resumed its activity in 1945 but ceased definitively in 1952.