This is an Ocean Edge dagger dive knife blade made by Hattori for Ocean Edge circa 1980s-1990s. Made with the precision you would expect from this renowned maker, it features a sturdy 3/16" thick satin finished stainless steel blade designed to have the guard slide on from the back and have a pommel screw on to retain the handle in place. It measures 9.25" long overall with a 4.5" long blade. A rare chance to build your own dive knife or replace your old blade. This blade is sharpened and tempered. In unused condition, recently found by Hattori in Seki, Japan.