Hawk2- I heat treated and tempered the blade, sanded with 320 grit to remove most of the scale, soaked it in vineger, and then rubbed it down with 000 steel wool. I wanted it to look old and dark.
LHunter- I made the blade.
Grey Whiskers- The blade is made from a Nicholson 14" lathe file. The blade is about 9 1/4" long and a hair over .2" thick. It is edge quenched and tempered for 1 hour at 425 degrees F. I haven't tested it. In fact I haven't even sharpened it. I have made several knives from Nicholson and Simonds files and heat treated them the same way. All have held a edge very well.