This is a Nederlandsche Arbeidsdienst (NAD) plate (1941).
Made by Petrus Regout from Maastricht in 1941.
The diameter is approximately 22,5 centimeters.
The plate is in very good condition, with the NAD logo in undamaged condition (this has usually faded off), there are a few imperfections in the glazing, being one on the front on the outside rim. This is not damage, but happened during the production proces.
Very hard to find.