I don't see any definite identifying marks. I can tell you it was my grandfather's and he fought in 2 wars. The item "WW2 Marine Raider Fighting Combat Knife Dagger Stiletto Commando With Sheath" is in sale since Monday, September 13, 2021.
This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\United States\Edged Weapons". The seller is "celshu57" and is located in Orangeburg, South Carolina. This item can be shipped to United States.