国立歴史民俗博物館は2026年5月23日、日本古銭の漢字銭文を高精度認識するAIモデル「KansenScript-v1」をApache 2.0で無償公開。銭文認識精度97.3%・推論0.8秒/枚を達成し、公開当日から古銭鑑定AI企業3社・大学研究室7機関が採用した。
May 2026: National Museum of Japanese History Releases Open-Source AI for Kanji Coin Inscription Recognition — Academic and Private Sectors Adopt Base Model on Day One

ITTENDO tracks auction records and market charts so you always know the current value of Japanese antique coins. Add coins to your Vault to stay on top of price changes.
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Dealers Handling This Category
A reference when considering a sale or appraisal. All are dealers and auction houses with a proven track record.
Ginza Coins
Ginza, Chuo-ku, Tokyo
One of Japan's most established numismatic dealers. The scale and variety of their regular auctions is among the largest in the country. Their catalogs are considered a benchmark for market pricing.
Japan Coin Auction (JCA)
Tokyo
Holds regular auctions with reliable hammer price data, making it a useful resource for tracking market values. Caters to a wide range of collectors from beginners to advanced buyers.
Taisei Coins
Tokyo
A dealer with an international network. Offers advanced services such as consignment to overseas auctions and NGC/PCGS grading submission. Recommended for high-value or internationally recognized coins.