WWII GERMAN NSKK SHOULDER BOARD DARK GREEN PIPED

Single sew on shoulder board of alternating silver/aluminum and black cord forming a checkerboard pattern with a dark green rayon piping and a black wool bottom. Original paper RZM tag is present. This shoulder board signifies the ranks of NSKK-Sturmmann to Obertruppführer and the piping color signifies M-Gruppe Leipzig or Saschen ?