Pine pitcher of the Sarthe in grey cameo sandstone

Here is a pitcher made of sandstone, grey enamels pricked with browns (note that the brown stain at the bottom of the pitcher on the 2nd photo is not a defect or a shock, but an effect sought by craftsmen). It is signed by thierry and chantal robert, potters in poncé-sur-le-loir in the sarthe around the 60s / 70s. This broc is in perfect condition, 16 cm high with a diameter of about 8 cm and weighs about 550 grams.