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1 Mon 'Chōnentaihō'
| Issuer | Japan |
|---|---|
| Year | 848-859 |
| Type | Standard circulation coin |
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| Obverse description | Cast copper cash-type coin featuring a central square perforation enclosed by a raised square border. Four large Chinese characters are disposed in the four cardinal quadrants of the field, reading clockwise from the top: 長 (chō), 年 (nen), 大 (tai), 寳 (hō), forming the legend 'Chōnentaihō' (Great Treasure of Many Years). The characters are rendered in regular script (kaisho) style with bold, well-defined strokes. A plain raised rim encircles the outer field. The surface displays an ancient patina of dark brown and olive tones with areas of verdigris. |
|---|---|
| Obverse script | Chinese |
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| Reverse description | Plain reverse typical of Japanese Heian-period cast copper cash coinage, featuring a central square perforation surrounded by a raised square inner border. The broad flat field between the inner border and the outer raised rim is entirely unadorned and devoid of any inscription or decorative element. The surface shows characteristic casting texture with patches of ochre, green verdigris, and dark oxidation patina consistent with age. |
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