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1 Mon 'Jōgan Eihō' - Seiwa
| Issuer | Imperial Japanese Government |
|---|---|
| Year | 870-890 |
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| Composition | Log in to see details |
| Weight | 2.8 g |
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| Obverse description | Cast copper cash coin of typical East Asian square-holed round form, bearing a four-character reign legend in Chinese kaishu (regular script) disposed clockwise around a central square perforation. The characters 貞, 觀, 永, and 寳 are arranged in the four cardinal positions — top, right, bottom, and left respectively — each framed between the inner square rim and the outer circular rim. The raised legends are rendered in bold relief against a flat field, with the stroke weight and foot details varying by die variety as documented in DHJ nos. 1.55–1.58. The coin exhibits a deeply patinated dark olive-brown and verdigris surface consistent with prolonged burial, typical of Heian-period coinage. |
|---|---|
| Obverse script | Log in to see details |
| Obverse lettering | 貞 寳 觀 永 (Translation: Everlasting treasure of the Jōgan era (read clockwise)) |
| Reverse description | Plain and uninscribed reverse, displaying the characteristic raised inner square rim surrounding the central square perforation and an outer circular rim, both cast in copper. The flat field between the rims is entirely blank, showing no legend, decoration, or mint mark. The surface is heavily encrusted with dark patina and patches of green verdigris, consistent with the coin's age and burial history. This unadorned reverse is standard for Japanese Kocho Junisen series cash coinage of the Heian period. |
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