Cross-country learning guide
Time-Bounded Currency Conversion
Documented official, treaty, bullion, and market relationships; explicitly not a universal historical converter.
Date requiredLocation requiredRate typeUncertainty
- Routes
- 14
- Relationships
- 8
- Ports
- 8
- Status
- Published
Not a universal converter
Every relationship requires date, place, type, and source
Official, treaty, market, and bullion relationships are not interchangeable. Missing numeric market values remain narrative rather than invented numbers.
| Date | Location | From | To | Type | Recorded rate | Limit |
|---|---|---|---|---|---|---|
| 1854–1858 | Shimoda and early treaty negotiations | Mexican silver dollar | Ichibu-gin | official | 1 dollar = 1 Ichibu-gin | Do not project beyond this date and location. |
| 1859–1860 | Opened Japanese treaty ports | Mexican silver dollar | Ichibu-gin | treaty | 1 dollar = 3 Ichibu-gin | A bounded treaty convention, not a general Asia-wide rate. |
| late 1850s | Japan | gold bullion value | silver bullion value | bullion | approximately 1:4.6 to 1:5 | Historical approximation used to explain incentives, not a posted retail quote. |
| 1878 | Shanghai | Mexican dollar | Shanghai tael / sycee | market | daily market value; documentary report notes premiums and variation | No single numeric rate is normalized because the cited record documents volatility. |
| 1946 | Taiwan | Taiwanese yen | Old Taiwan dollar | official | 1:1 | Postwar administrative conversion; banknote context only. |
| 1949 | Taiwan | Old Taiwan dollar | New Taiwan dollar | official | 40,000:1 | Postwar currency reform; banknote context only. |
Source trail
Institutional and contemporary evidence
Bank of Japan Currency MuseumHistorical events and currencies in useMinistry of Finance, Republic of China (Taiwan)Bank of Taiwan and the New Taiwan Dollar transitionUnited States Office of the HistorianForeign Relations, 1878: silver, sycee, assays, and exchangeUnited States Office of the HistorianForeign Relations, 1878: silver dollars at Chinese portsBritish MuseumMexican 8 reales with Chinese chopmarksBank of Japan Currency MuseumYokohama treaty-port display and the 1859 countermarkNational Museum of Taiwan History1872 Mexican eagle dollar collection recordCentral Bank of the Republic of China (Taiwan) Currency MuseumDevelopment of currency in TaiwanMinistry of Finance, JapanMinistry of Finance history: Trade YenJapan MintJapan Mint history of the one-yen coinHong Kong Monetary AuthorityMonetary systems in Hong Kong's historyRoyal Mint MuseumBritish Trade Dollar