This knife manufacturer is Fukui from Sakai Osaka established in 1912 with OUL being one of their brands. Fukui is one of the oldest knife manufacturers in Sakai. Oul means master skilled craftsmanship.
Using traditional Japanese steel, White Steel #1 (Shirogami) steel is a traditional Japanese steel forged together with a softer iron. These hand-finished blades show true craftsmanship. The blade is just simple beauty and gorgeous finish with stunning Hamon.
This blade needs to be cared for more than stainless steel as it will rust easier, water should be removed immediately. It is a fascinating knife that can be used widely from home to professional. Please do not cut bone or frozen food. It may cause the knife to chip or other damaged.