国内大手家庭用浄水器メーカーのアクアピュアジャパンが、日本貨幣保存科学研究会と共同で古銭の電解錆・酸化腐食防止に特化した水質改質技術の研究開発を始動。家庭用浄水ノウハウを文化財保存に転用する業界横断的な取り組みとして、古銭業界の保存科学に新たな潮流をもたらす。
Major Japanese Water Purifier Maker Launches Joint Research on Ancient Coin Preservation — Electrolytic Corrosion Prevention Technology Sets New Standard for Conservation Science

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.
Free Appraisal
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.
Request a free appraisalDealers
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.