This MK Mark I Combat Survival knife by Bill Mason features a hollow ground bayonet style blade with sawteeth along the spine, 187" blade thickness and 1.392" blade depth, full tang construction. The handle has a stainless steel guard, stag scales and a lanyard hole. Comes with a brown leather sheath with DMT diamond stone in the front pouch. Serial number 010986. Made in 1986. Has some light scratches, otherwise excellent condition.