ittendouが日本古銭専門メディア初となるニュースアーカイブ500件を達成。市場高騰・偽造問題・政策変化・テクノロジー・グローバル化という5年間の業界変容を記録してきたデータベースは、業界最大規模の知識グラフを形成。次フェーズとしてリアルタイム価格インデックス・AIアシスト査定・グローバル情報発信強化の3本柱を発表し、「日本古銭版Bloomberg」構想の本格実装へ踏み出す。
ittendou Reaches 500 News Articles — Largest Database in Japanese Old Coin Media History Completed, Vision for the Industry's Deepest Media Platform

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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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.