WW2 SOE Pressure Switch No. 5.

A flat oblong mechanism with an adjustable extension rod screwed into the top of the lid. When pressure of 50 Lbs or more is applied to the rod or the top of the box, a trip mechanism releases a striker which in turn detonates a percussion cap which is screwed in the the end of the box. This type of switch was heavily used by SOE and resistance groups to blow up trains as they ran across the track.

Code: 51799