国内大手AIエージェント企業のAIコア株式会社が、日本古銭・古貨幣市場に特化した鑑定支援AI「CoinSense」を業界向けOEM形式で提供開始した。鑑定機関・大手販売店・オークションハウス計12社に導入され、月間120万件の自動判定を実施中。AIが真贋・コンディション・参考価格を3秒以内に提示することで、専門鑑定士の一次スクリーニング工数を最大70%削減し、業界全体の処理能力を飛躍的に向上させている。
Leading Japanese AI Agent Firm Launches OEM Coin Authentication AI for Industry — 1.2M Monthly Auto-Appraisals Integrated into Authentication Bodies and Major Dealers

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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Get your old coins appraised — free of charge
Edo-era silver, koban, commemorative medals, foreign coins and more — just upload a photo. Our specialists reply with an estimated valuation by email within 2–3 business days.
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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.