Ueno medium Japanese sharpening whetstone

The Ueno medium Japanese sharpening whetstone refers to a natural Japanese whetstone (toishi) from the Ueno mine/area (likely a mistranslation or variant related to Kyoto/Tamba region natural stones). These are traditional natural waterstones, often graded as medium to fine in the approximate range of 800-2000 grit (or up to mid-grit like ~4k in some classifications for harder upper-mid examples). They are known for producing a smooth, detailed kasumi (cloudy/misty) finish on blades, with good feedback and speed for natural stones.