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Chinsho Okamoto was born in 1870. Original personal name was Yoshikuni.
Chinsho Okamoto studied seal engraving under his father. He went to Tokyo (1889) and studied under Keisho Nakai.
He served in the Imperial Household Ministry's Archives Bureau.
He established the Meiji-lngakusha, a seal engravers' school, and the Teibi-Insha, an engraving society, to popularize the art.