Authentic Old Keng Natural Suzuri (Laokeng Tianran Suzuri) purchased from SEIBU Department Store decades ago. This is a top-of-the-line suzuri (inkstone). It was given to me. Laokeng is currently prohibited from being mined and is unavailable, so I believe this is a very valuable item. ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ ＜AI Summary＞ Laokeng is the highest grade of stone used in Duan inkstones (Tankeiken), a type of Chinese inkstone. Its characteristics are that the stone quality is very fine and dense, with a smooth texture like a baby's skin, and it excels in ink spreading and color development. In addition, unique and beautiful stone patterns often appear, and various patterns emerge when wet. Highest Grade Stone Quality: It is considered the most valuable stone material among Duan inkstones. Fine and Dense Stone Surface: The stone has a high density and is very smooth, just like "a baby's skin." Water-immersed Mine: The mine called "Laokeng" in Duanxi is always submerged in water, and is also called "Laokeng Shuiyan," and is considered to be a stone polished by water for tens of thousands of years. The Best "Ink Grinding": Praised as the "best inkstone" by historical calligraphers, it maximizes the performance of the ink used. Laokeng is currently prohibited from being mined, and its stone material is either exhausted or extremely valuable. Therefore, many of the Laokeng currently in circulation may be substitutes with stone patterns similar to Laokeng, and to distinguish whether it is a genuine Laokeng, it is necessary to assess the density of the stone. ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ This is a used item that was given to me, so please judge the condition from the photos.