WW2 M3 Imperial Trench Knife W/Ordnance Bomb Stamp. MARKED USM3 IMPERIAL ON CROSS BAR. CROSS BAR HAS VERY LITTLE MOVMENT. The item “WW2 M3 Imperial Trench Knife WithOrdnance Bomb Stamp” is in sale since Wednesday, January 27, 2016. This item is in the category “Collectibles\Militaria\WW II (1939-45)\Original Period Items\United States\Edged Weapons”. The seller is “aviationetc” and is located in Toms River, New Jersey. This item can be shipped to United States.