From the case:
Signet ring (photo)
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Signet-ring of the Black Prince (1330–1376).
Case Discussion
Author: Louvre Museum, Public domain, via Wikimedia Commons
Original file: https://upload.wikimedia.org/wikipedia/commons/a/a6/Signet-ring_Black_Prince_Louvre_OA9597.jpg
Modifications: none
License: Creative Commons Attribution-Share Alike 4.0 International license.
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