Nachi Black Stone Inkstone - Unused

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This is a Nachiguro inkstone made from Nachiguro stone mined in Nachikatsuura Town, Wakayama Prefecture.
Material: Made from Nachiguro stone, which has a jet-black and dense texture.
Purpose: A tool used in calligraphy to grind solid ink to make ink.
Features: Known for its good stone quality and excellent ink spread.
The purchase date is from the Showa era, as my 88-year-old mother purchased it a long time ago!
Size:
Approximately 14 cm in height
Approximately 10.5 cm in width (at the widest part)
Approximately 1.5 cm in thickness
Please also see the attached photos.