Verdict: Never buy thin Koban (<3mm) without 3D-certified authentication—PMD misidentification costs collectors 10x valuation swing.
1982 D Cent's Dished Center Revealed as Struck Through Die Cap Error
Apr 18, 2026CoinTalk
Period
Edo Period
1603–1868
2 articles
Verdict: Pre-purchase authentication via professional graders mandatory; self-judged acquisitions carry 50% counterfeit risk + 30-50% overpayment exposure.
Novice Collectors Face 3 Major Pitfalls in Kecho Koban Market
Apr 13, 2026CoinTalk