Shakudo is mixed metal whose material consists of copper and small portion of gold.
*Takabori: one of engraving techniques which make a pattern stand out.
*Kinzougan: Gold Inlaying
*Tokubetsu Kicho Kodougu Ninteisho is the certification issued by a trusted Japanese antique group that proves the item is authentic and original.
Society for Preservation of Japanese Art Swords(Nihon Bijutsu Touken Hozon Kyokai)