Veteran Bring Back German WWII INERT Ordinance Pressure Igniter S MI.35 for S-Mine-This mine is also known as the bouncing Betty or Sprengmine 35. This would screw into the central threaded well at the top of the mine, it functioned as the primary trigger mechanism when stepped on or depressed. This is completely INERT. We were lucky enough to buy this from the son of a veteran. We will supply the name of the soldier to the buyer.