This article, prepared by the editorial team of Ittendo, provides a market analysis of Japanese coins rather than reporting specific auction results. The figures are derived from auction data collected by our site, totaling 1,334 transactions.
When researching coin market values, confusion often arises. Stories claim "Keicho Oban coins sell for tens of millions of yen," yet actual transaction records show vastly different figures. Where does this disparity come from? Using data collected by Ittendo, we explain the reasons clearly.
Market Prices of Edo Period Gold Coins
Out of 1,334 collected cases, we analyzed 890 transactions excluding sets, reference items, non-coin-related items, and items with authenticity uncertainties. From these, 172 were Edo gold coins. The median price among them was ¥2,800, with a maximum sale of ¥267,000. Only seven transactions exceeded ¥100,000, and none surpassed ¥500,000. Items including the term "Koban" numbered 218, with a median price of ¥2,915. "Oban" items were 82, with a top price of ¥267,000. The data show no transactions close to the multi-million yen level.
Different Markets, Different Prices
Our data sources mainly include 554 transactions on Mercari and 335 on Yahoo Auctions, as general, open-market platforms—excluding specialized auctions. In contrast, top-tier items like Keicho Oban coins are traded in dealer auctions or specialized auction houses with limited offerings and participants. Although termed "Japanese old coins," trading venues drastically vary.
Quality also diverges; many online "Koban" offerings are commemorative replicas or subsequent recasts. Even though we exclude such replicas from our data, we can't identify every inauthentic item by name. Thus, the median of ¥2,915 reflects a mixed market reality.
Factors Influencing High-End Coin Prices
Top-tier coin prices aren't high solely due to age but primarily due to scarcity. Keicho Oban coins, limited in original mintage, have dwindled over time. Authenticity is verified by grading institutions or reputable provenance, directly impacting value. Buyers at this level are typically long-term collectors or asset preservers, not short-term speculators. Such factors don't apply in flea-market environments, leading to different price mechanisms.
Verifying Market Figures
When evaluating coin prices, examine which market the figures come from. "Koban market value" varies between general circulation and graded exchanges. Neither is incorrect, but relevance depends on your buying or selling context. Our data represent the former and are calculated under publicized conditions, allowing transparency in exclusions and inclusions.
Excluded from Aggregation
We excluded 444 records due to unquantifiable single-coin prices. These include "sets," "reference items," "replicas," and accessories like paperweights, coin cases, or framed items. Items labeled "untested" and "as-is" are excluded. Exclusions are detailed in our methodology to empower better data interpretation.
Assessing Your Coins
If you possess a Koban or Oban and seek its value, don't directly apply our median. If genuine, your coin may surpass our lower range; a replica or token may at most equal it. Authenticity is crucial. Consult our fake detection guide or seek expert evaluation for high-value expectations.
Conclusion
Prices vary significantly depending on the marketplace, even for "Japanese old coins." Our 890 records reflect standard market transactions, where Edo gold coins median at ¥2,800, with no recorded sales above ¥500,000. Elite coins moving for millions reside outside these records, driven by scarcity, authenticity, and specific buyer demographics. Understand the data source before drawing conclusions; our conditions are public for this reason.