Mug or brutalist sandstone cup from the 50s/60s

Very nice mug around 1960. Model of brutalist spirit characterized by the minimalism of its lines and the use of natural materials, here the sandstone called flamed "grand feu" by arts ceram (signature under the mug, see photo). Height 9.5 cm, diameter 9 cm, 14 cm with handle. In perfect condition (neither crack nor shine), this pretty mug very qualitative, completely in the current deco style, will bring a refined natural touch to your table or simply in decoration.