G7主要7か国の貨幣博物館長が東京に集結し、日本主導の古銭・近代貨幣保存基準「ICP-2026」を満場一致で採択。温湿度・光源・梱包素材・デジタル記録の国際統一規格が確立され、日本古銭市場の信頼性向上と国際流通への追い風が期待される。
Japan-Led Coin Conservation Standards Adopted at G7 Cultural Heritage Talks — Directors of Major National Currency Museums Agree on Unified Guidelines

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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.