The WN-tab is from the Wachgruppe/Wachtkorps Nordland. A guard company active for the Germans in Belgium, among guarding Luftwaffe installations. Why do collectors almost never buy good and relevant reference-works !!!!! In this case
"David Littlejohn - Foreign Legions of the Third Reich, Vol. 3, Addendum page 303" published by Roger Bender Publishing 1985. Remember a good reference library is saving money (i.a. buying fakes) and will increase your knowledge about your own interests.