Marschkompass Busch

There is a foldable ruler. This compass is marked:

  • – Busch
  • – 30846
  • – D.R.G.M. Deutsches Reich Gebrauchs Muster, patented in Germany.
  • – 1934

Stick your thumb in the ring. Strech your arm, aim the little visors on the target and read the angle in the mirror.