BIBLIOGRAPHY
Japanese Wikipedia, "One-yen note"
Wikipedia (according to the sources of each article)

Claims Supported by This Source
- The Daikoku one-yen note reads, "Exchangeable for one yen in silver coin."
- From October 1897, it was legally a gold convertible note, but since one-yen gold coins were not minted, it was de facto inconvertible; in May 1942, it became legally inconvertible as well.
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