国内大手投資情報プラットフォーム「株式会社フィナンシャルインサイトジャパン」が日本古銭市場初の総合価格指数「JCI(Japan Coin Index)」を開発・公表。主要50銘柄の市場価格指数を毎日更新し、業界の価格透明性向上と機関投資家参入促進を図る。
Major Domestic Investment Information Service Develops and Publishes Antique Coin Index — Daily Updates for Top 50 Coins to Improve Industry Transparency and Attract Institutional Investors

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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.