Colonial Knives - WWII U.S. Navy Mark I Combat Utility Fixed Blade Knife with Grooved Black Metal Handles. Model: COL10000. 10 1/4" overall. 5 1/8" high carbon steel blade with black anti-reflective finish and USN tang stamp. Grooved black metal handle with integrated guard and pommel. Tan leather belt sheath embossed U.S.N.