Archive: People and Markets
PMG Grading On-site in Munich and at MIF Maastricht
In September 2023, Collectors and dealers can submit banknotes at the PMG Munich office or at PMG’s booth at the MIF show for on-site grading.
The Numismatic Index numindex in November 2023 – Your Feedback Counts!
At the beginning of the year, numindex was launched as a kind of stock index for coins. In addition to regular updates, some helpful new features have since been introduced. Your opinion as a CoinsWeekly reader is now needed!
Archive: Coins, Medals and more

Counterfeit Detection: Altered Prussia 20 Mark
An NGC expert gives us insight into his everyday life. He shows how the year on a coin from the German Empire was altered by a coin doctor.

Planchet Error, Overstrike, Double-Strike, Etc.: Which Errors Affect the Price of a Coin? – Part 1
The price of a coin does not only depend on its rarity and grade. There are many things that can affect a specimen’s value in a positive or negative way. This overview will help you to understand common terms, to use them confidently and to understand them in their context.










A New Member to Join the SINCONA Team: Michael Otto
The SINCONA team is excited to welcome a new member. As of 1 January 2025, Michael Otto is working at the SINCONA Group’s headquarters in Zurich. He is looking forward to taking over the position as Head of Numismatics.
Stack’s Bowers Galleries Launches Coin Resource Center
Stack’s Bowers Galleries announced the launch of their Coin Resource Center. The new website is a detailed reference guide for all U.S. coins with historical backgrounds of each U.S. Mint and insightful Collector Guides.