License, verbatimCC-BY
ColBase (National Institutes for Cultural Heritage, Japan): image published under Creative Commons Attribution 4.0 (CC BY 4.0), stated as schema:license on the item's own access record in Japan Search. Attribution required; terms: https://colbase.nich.go.jp/pages/term?locale=en
貞観永宝、寛平大宝、延喜通宝、乾元大宝、政和通宝(隷書). . ColBase (National Museums of Japan).