1. (Jeffrey Smith per Keith Wilson, July 29, 2008) "Ceremonial Object" added as secondary classification.
2. (Stephen Allee, March 25, 2009) As per Jenny F. So, Jade Project Database, changed Period One from "Western Zhou 周 dynasty" to "Early Eastern Zhou 周 dynasty." Jenny F. So also gives Date as "771--475 BCE" and Title as "Disk with double incised dragon heads"; but as per Keith Wilson, changed current Date from "10th century BCE" to "7th--6th century BCE"; changed Title from "Disk (bi) 璧" to "Ring with dragons"; changed Object Name from "Disk (bi) 璧" to "Jewelry"; and added "Spring and Autumn period" to Period Two. Designation "nephrite" added to Medium "Jade," as per Janet Douglas, using infrared spectroscopy (June 2006). Added Measurements (Diam x D: 17.0 x 0.6; Diam [hole]: 6.9) as per Christine Lee, Jade Project Database. Also added Published References (1 item), as per Jenny F. So, Jade Project Database.
3. (Susan Kitsoulis per Keith Wilson, October 20, 2010) Title changed from "Ring with dragons" to "Disk (bi) 璧 with dragons"; changed Period Two from "Spring and Autumn period" to "Late Spring and Autumn period."
4. (Najiba Choudhury per Keith Wilson, May 22, 2023) Period One changed from "Early Eastern Zhou dynasty" to "Eastern Zhou dynasty"; Period Two changed from "Late Spring and Autumn period" to "Spring and Autumn period"; Date changed from "ca. 7th-6th century BCE" to ca. 600-476 BCE"; and added Chinese Caption by Jingmin Zhang.
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