Japanese antique coin knowledge, accessible to everyone — anywhere in the world.
ITTENDO aggregates, translates, and organizes Japanese antique coin information from across the globe —
creating a specialized media platform that sharpens your eye with every read.
Why ITTENDO exists
Information is scattered
Overseas articles, auction results, and research are fragmented and hard to follow.
Price history is opaque
Records appear as isolated data points — it's unclear why prices moved.
Authenticity risk is real
Counterfeits, altered pieces, and suspicious lots are difficult to avoid without expertise.
Selling is a mystery
Buying is one thing, but selling — and finding a fair exit — is far harder.
Our Concept
Every article sharpens your eye.
ITTENDO is not a news site.
We are a media platform built to help you understand and make confident judgments about Japanese antique coins.
Three values ITTENDO delivers
Global Japanese coin intelligence
Overseas auctions, academic articles, excavations, and counterfeit alerts — curated and summarized from sources worldwide.
- Breaking news
- Research & discoveries
- Authenticity alerts
Learning DB (Coinpedia)
An encyclopedia that ends the "searched but still confused" experience. Types, eras, characteristics, value structure, and authentication guides — continuously expanded.
- Field guide (type & era)
- Authentication tips
- Common traps
Auction history & market context
We don't just list prices — we edit them into a readable story so you understand why values moved.
- Historical lots organized
- Price movement logic
- Condition, rarity & liquidity
Our Philosophy
The value of antique coins should not belong exclusively to insiders.
We convert information into understanding —
providing a foundation for everyone to make their own decisions.
Our Promise
- No one should lose out just because they lacked knowledge.
- No one should fail simply due to missing information.
- We work to reduce a world where only insiders win.