Here it is:
Here is a Google search for “ANWB Badge”:
google.co.uk/search?q=anwb+ … CAcQ_AUoAg
“Wegenwacht badge”:
google.co.uk/search?q=wegen … CAYQ_AUoAQ
The badge does not crop up once in either search, yet it appears on all sorts of old Dutch vehicles. It is a mystery.