British No.4 Mk I Pull Switch – SOE / OSS (F87 AA) Equipment English) above and “SALM” (Suid-Afrikaanse

English) above and “SALM” (Suid-Afrikaanse Lugmag

The design prominently features a castle

being favoured by officers or well-connected non-commissioned personnel seeking stronger

The crown reflects loyalty to the monarchy

British No.4 Mk I Pull Switch – SOE / OSS (F87 AA) Equipment English) above and “SALM” (Suid-AfrikaanseAn original British WWII No. 4 Mk I pull switch, designed for use as a sabotage initiator by Special Operations Executive (SOE), Office of Strategic Services (OSS), Commandos, and sabotage units. The device consists of a small cylindrical brass body with a central striker mechanism, retaining its original trip wire wrapped around the device. When tension is applied to the cord, the striker is released, setting off an explosive charge or detonator cap.