The “Higonokami short knife” or HIGO is a traditional Japanese pocket knife that dates back to 1894. The simplicity of these blades is truly what makes them remarkable. By omitting any bells and whistles, they’ve ended up with an exceptionally rugged tool with a low failure rate.
Sharpening them is really easy, and the design ensures that there’s virtually nothing that can break. Simply sharpen the blade flat on a whetstone from time to time, and tap the hinge with a ball-peen hammer when it begins to feel loose.