BIBLIOGRAPHY
Japanese Wikipedia: "Dōzō Amida Nyorai zazō," "Dosō," "Saisen"
Wikipedia (Sources: Shiozawa 2010, Hirao 2008, "Kaigen Sōzu Ki," et al.)

Claims Supported by This Source
- The average composition from the Shōwa era repairs (1959–61) was 68.7% copper, 19.6% lead, and 9.3% tin (Shiozawa 2010). It has been suggested that bronze coins imported from China were used as material (Hirao 2008). The origin and procurement route require further verification.
- Dosō: High-interest moneylending businesses under the protection of powerful temples and shrines such as Enryaku-ji. There were 330 in Kyoto during the Shōwa era (1312–1317) and many in Sakamoto as well ("Dosō").
- The "sansenbitsu" (offering chest) placed at Tsurugaoka Hachimangū in 1540 is the oldest recorded "saisenbako" (offering box) ("Saisen," "Kaigen Sōzu Ki").
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