US Army Machete sheath

Genuine Govt Issue Vietnam Plastic Machete Sheath. This one has US 1966 Marmac Stamped into the plastic on the back but other model might have different stampings. Has swivel hook for pistol belt and a unique self sharpening piece that you can move over and sharpen machete as it is pulled out. Measures 19" long.
These items were left by the Americans in Vietnam after the war.