It is by Jake Fowler of Jake’s Custom Knives. Jake is a 22-year-old maker who seems to specialize in forging blades from recovered steel.
I dove deeper down the bunny hole that is his YouTube Channel, and I really liked this trench-knife from gears develop I found. Unlike springs, which may have micro-cracks from flex-cycles, gears are exempt to this manner of stress. They are usually made from very tough steel.