This is a Belgian/German Wold War 2 propaganda postcard: SS Brigade Wallonië, for recruiting ne members for the 28. SS-Freiwilligen-Panzergrenadier-Division Wallonien.
Several postcards are known, but the postcards with this particular design are very hard to find!!!
On the back is a stamp:
“Bureau de recruitment
SS Brigade Wallonië
18, R. du Marche-aux-Poulets
In good condition, only a mall spot on the left S of the SS logo.