I generally use new materials on all my knives, especially for the blades. With a lot of used materials there is no telling what it’s really made of (metallurgically speaking) so it can be difficult to get the best heat treat out of the steel. When I sell a knife I like to have peace of mind, and know how it will preform over long term use. There are some things that I love to repurpose for blades though, and good quality files are among my favorites.
This blade is made from an old Nicholson file that was dulled beyond use for much of anything, however it makes a wonderful knife! The handle is a black walnut cutoff from a local wood worker that I know Chris Otto. The blade is 4″, and is very handy for all sorts of different tasks. This knife is for sale at my etsy store.