Vintage oyster service in Sarreguemines dabbling

Set of six oyster plates with serving dish of the sarreguemines, 70s. Each plate has 6 compartments for oysters or other shellfish plus one in the centre for lemon or sauce; the serving dish has 12 compartments plus one central. The whole thing is in perfect condition, except for 3 tiny gaps on a single plate (see photo). Diameters (cm): plate: 23.5 / flat: 37.5.