Tenpō Tsūhō
天保通宝（tenpō tsūhō） ・ aka: 当百銭
- Series
- Edo-period 100-mon coinage
- Denomination
- 100 mon
- Period
- 1835 (Tenpō 6)
Updated: 2026-09-02
Specifications (as confirmed)
| Item | Value | Type | Sources |
|---|---|---|---|
| Issue & inscription (catalog) | 1835年・「当百」 | Catalog value | [1] |
Historical Context
Visual Identification
FACTThe reverse bears the inscription "tōhyaku" — current for one hundred mon.[1]
Varieties & Attribution
INTERPRETATIONDomain castings and calligraphic types are distinguished by collectors; individual type attributions are not yet confirmed in the consulted sources.
Manufacturing
FACTCast at the coin mints to earn seigniorage while copper 1-mon casting ran at a loss.[1]
Authentication Cautions
FACTThe catalog states counterfeits were numerous from the start — authentication has been the standing issue ever since; it also passed below face value, which frames its valuation.[1]
Terminology (JA/EN)
FACT"Tōhyaku" — a legend marking currency at 100 mon.[1]
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（全国各地にあった銭座）」（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/index52.html（accessed: 2026-09-02）