It is indeed a shoulder board, but the badges are not meant to be on there. The first is a WHW police tinnie and the other a DAF membership pin by the look of it.
Shoulder board is for Pioneers, if waffenfarbe is black.
Thank you for your quick reply
learning more every day
Could you show the back of the shoulder board . Is it a slip on or sew on .
Thanks for the back photo , nice slip on . Did the DAF ever use such a strap ,the cog wheel looks like it could belong .