This is a WHW (Winterhilfswerk) Kreis Duisburg plate from 1937-38.
The diameter is approximately 28 centimeter.
It has an amazing artificial bronze colour, but is made of terracotta.
Running towards the border is written on the front: “Mit Brüdern in Not Teile dem Brot”.
On the back is a makersmark and the name “Höhr”.