The model 1931 can be disrespectfully described as the Adrian 2.0. It is made out of better quality steel and made out of two pieces (shell and comb). On the front the lion head is also visible. It provided better protection from bullets and shrapnel but it stayed true to it's predecessor.
Below an example of a model 1931 worn by the Waalse wacht/ Gardes wallonnes. Collaborationist that supported the German Wehrmacht