1. (Jeffrey Smith per Keith Wilson, July 8, 2008) Ceremonial Object added as secondary classification.
2. (Stephen Allee, March 24, 2009) Jenny F. So, Jade Project Database, gives Period One as "Late Eastern Zhou 周 or Early Western Han 漢" and Date as "475-100 BCE"; but as per Keith Wilson, retained "Western Han 漢 dynasty" and changed Date from "200-1 BCE" to "2nd-1st century BCE." As per Jenny F. So, Jade Project Database, added Previous Owner "Ex collection Abel William Bahr"; also added Description, Related Works, and Published References (1 item). As per Keith Wilson, changed Title from "Flat disk (Bi 璧) with surface decoration" to "Disk (bi 璧) with dragons and spirals"; changed Object Name from "Disk (bi 璧)" to "Ceremonial object." Changed Medium "Jade" to "Jade (?)" as no scientific analysis is recorded. Added Measurements (Diam x D: 18.0 x 0.55; Diam [ hole]: 6.1), as per Christine Lee, Jade Project Database.
3. (Jeffrey Smith per Matthew Clarke, July 11, 2022) Medium changed from "Jade (?)" to "Jade (nephrite)."
4. (Najiba Choudhury per Keith Wilson, June 7, 2023) Title changed from "Disk (bi) with dragons and spirals" to "Disk (bi) with raised uniform curls arranged in a grid and masks"; and Date changed from "2nd-1st century BCE" to "206 BCE-9 CE."
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