2026年5月に開催された国内最大手コインオークションで、総落札額が287億円に達し、単月の国内記録を更新した。入札参加者の55%以上が海外バイヤーで占められた初めてのケースとなり、日本古銭マーケットの国際化が新たなフェーズに突入したことを示している。
Japan's Largest Coin Auction Sets May Record at ¥28.7B, Overseas Buyers Hit 55% for First Time

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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.