Sheath
Within the same basic model, four different variants of the Marine Raider sheath have been noted and identified. These variants include the four combinations of with and without steel staples at the throat portion of the sheath and with and without steel tip plates (1.75 in by 2 in), front and back of the sheath to prevent the sharp tip from piercing the scabbard and injuring the wearer.
The purpose of the row of staples at the throat was to prevent the sharp knife from slashing through the sheath. Unfortunately, these staples could severely scar the stiletto blade. It is believed that these sheath variants evolved by trial, as the late issues had both staples and plates.
Read more about this topic: United States Marine Raider Stiletto