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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.