Antique Japanese Iron Mortar Yagen Grinder Crushing Tool

AMBIANIC presents
Old Japanese iron boat shaped mortar or grinder crushing tool (called Yagen)
Tool used to grind medicine
21.5 W x 7H x 5.5 W Disk 12.5 W x 9 in diameter
Unrestored worn aged vintage distressed condition.
Refer to images please.