Chopmark Articles & Publications
Online forum with frequent updates and collector engagement
Reddit: r/Chopmarkedcoins
A fun interactive mapping of world trade coins with chopmarks
chopmarkmap.com
Article on foreign silver in China and shroff handbooks
"Journal of East Asian Numismatics: Organized Chaos － Chopmarks on Foreign Coins"
General overview of chopmarked coins
"Journal of East Asian Numismatics: Chopmarked Coins – China’s Most Underappreciated Numismatic Field"
Brief intro to collecting chopmarked coins (10/2024)
"PCGS: Collecting Chinese Chop-Marked Coins"
Excellent article on the Canton Trade in China
"Chinese Export Silver: The China Trade - Relative to the Silver Trade"
The difference between chopmarks, countermarks, and counterstamps
"Sedwick Blog: Chop Chop: Quick Guide to Chopmarks, Countermarks and Counterstamps"
Brief intro to collecting chopmarked U.S. Trade Dollars (1/2025)
"Greysheet: An Introduction to Chopmarked Trade Dollars"
Article on Capped Bust Half Dollars with chopmarks (1/2026)
"Greysheet: No Dollars? Capped Bust Half Dollars in the China Trade"
Article on the 1870-S half dollar, also discusses chopmarks on US halves (3/2026)
"Greysheet: A Rare Coin that has No Business Being Rare"
Academic research paper discussing the presence of foreign silver in China (requires academic institution login)
"Foreign Silver Coins in the Market Culture of Nineteenth Century China by Richard von Glahn"