Belgian Issue M71 Paratrooper Helmet.
This is a rare variation of the German produced M71 Paratroop/Airborne helmet for the Belgian army, Belgium purchased the same M71 type helmet from the German firm Schuberth, that was producing these for the West-German federal army, with minor modifications..such as the paint and the chinstrap, and the Belgian tri-color decal on the left side of the helmet.
