Hi Bernd
Nice set of boards I particularly like the boards with the black centre stripe for Oberscharfuhrer, After 43 these type of boards where used by the Luftschutzpolizei Instandsetzung (Repair Units) officers. The other ranks had a strange combination of White eagle, black collar patches and shoulderboards.
Of note I believe the Meister boards are postwar, these should have brown centres