The MOD4 is currently produced by J.Adams. Earlier ( and much nicer) versions were made by Sheffield. If you buy one get the wooden handled version. It is a very crude grip and will wear you out. At least the wooden handle can be sanded somewhat. The sheath is junk. The knife is descended from the ww2 brit paratroopers survival machete, which Martindale still makes. It is 1/4"thick and will require MAJOR reprofiling to get a useable edge. It is a relatively soft Rockwell which makes for easy sharpening ( and easy dulling.) I managed to hack my way out of an abandoned trailor ( caravan) with it in @ an hour of exausting work. I personally wouldn't buy another one, but it is a virtually indestructable .