AG Russell, USA made One Handed Knife. The handle, machined from a piece of solid stainless spring steel, works with the blade to create an unusual locking system. This locking system, and the location of a thumb stud on both sides of the blade, allows the knife to be closed or opened one handed using either hand. This model with blade made of CPM-154 was introduced in 2008 but production was stopped because of how difficult they were to make.