Set of 4 bowls Niderviller Gervais

Set of 4 vintage bowls with pedestal of the earthenware factory of niderviller with advertising for gervais. Each bowl is decorated with a breed of cow: the Montbéliarde, the Armorican, the Aubrac and the Norman. White bowls, blue and green friezes, representation of the cow in brown. I couldn't find any information about these bowls, nor any photographs. I think they must be quite rare. To report a small shock (behind) at the foot of one, some lack of enamel on 2 others. Diameter: 14 cm height: 8 cm. Very nice country spirit!.