Koban comes from Series 3, a set in Cardsmiths Currency, a premium collector line tracing the history of money from ancient coinage to cryptocurrency. Collectors chasing it have 21 variants to find, and Onyx is the tightest of them at 1. This is card 29 on a 87 card checklist. Rachid Lotf illustrated it.
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Koban are oval-shaped, gold coins that entered use during the Edo period of feudal Japan, Koban were equal to one ryo, which was in turn equal to 1 koku, or approximately 330 pounds of rice.
