The Twelve Imperial Coins (Kōchō Jūnisen)
皇朝十二銭（kōchō jūnisen）
- Series
- Ancient coin series
- Denomination
- 1 mon (initially)
- Period
- 708–958
Updated: 2026-09-02
Specifications (as confirmed)
| Item | Value | Type | Sources |
|---|---|---|---|
| The twelve issues (catalog) | 708〜958年 | Catalog value | [1] |
FACTWadō Kaichin 708, Man'nen Tsūhō 760, Jingū Kaihō 765, Ryūhei Eihō 796, Fuju Shimpō 818, Jōwa Shōhō 835, Chōnen Taihō 848, Nyoyaku Shimpō 859, Jōgan Eihō 870, Kampyō Taihō 890, Engi Tsūhō 907 and Kengen Taihō 958 — twelve types (catalog).[1]
FACTDeclining copper output made the coins ever smaller and cruder — heavily leaded from the late 9th century — and after the Kengen Taihō no copper coin was issued; rice and silk served as money (catalog).[1]
Historical Context
Open Items
INTERPRETATIONSpecifications not stated here (weight, fineness, mintage, etc.) are not yet confirmed in the sources consulted. They will be added as they are confirmed.
Auction Records
No auction records confirmed for this exact type yet. Prices for the broader category are not shown as this type's prices. Confirmed records will be listed here.
References
- [1]「貨幣博物館 常設展示図録（古代銭貨の移り変わり）」（日本銀行金融研究所 貨幣博物館） — https://www.imes.boj.or.jp/cm/collection/tenjizuroku/mod/book/pageindices/index21.html（accessed: 2026-09-02）