Although I do not recognise the model I recognise the style. Maastricht did this sort of black footed bowl, as did Leerdam, as did the Belgians, as did the Czechs.
The material is almost certainly iridescent Annagreen; the foot may be opaque (Leerdam, Czech) or black amethyst (Maastricht, Belgium). Timewise it is 1930s with a very high probability.