Archive: People and Markets
NGC introduces New High-Security Hologram with QR Codes
NGC is introducing a new high-security hologram as part of its efforts to combat counterfeiting of certifications. Among the hologram enhancements are a QR code and a numerical security code that are unique to the specific encapsulated collectible, making it extremely difficult for counterfeiters to replicate or tamper with the NGC holder.
Report of the ICOMON 29th Annual Conference in Kuala Lumpur
The 2023 ICOMON conference was held in Malaysia. Read here about the program, the topics presented and discussed, and where you can watch the presentations online.
Archive: Coins, Medals and more

Cleaning, Patina, Verdigris etc.: Which Errors Affect the Price of a Coin? – Part 2
The price of a coin does not only depend on its rarity and quality. In the second part of our overview we will talk about wear and tear, cleaning and the consequences of environmental processes.

The Suffering of Leiden – A Siege During the Dutch Revolt
The third part of the Beuth Collection that Künker offers in Auction 420 contains many historically interesting emergency and siege coins. They were issued by the Dutch towns besieged by Spain during the 80 Years' War. One of these towns was Leiden, which to this day commemorates the end of the siege every year with a festival.















Numisma – The Zoom Seminar Series of the Australian Centre for Ancient Numismatic Studies
Today the online lecture series NUMISMA starts into the second half of the year. Students, researchers and collectors who are interested in ancient coins are very welcome! Find the upcoming lectures here.
On Our Own Account: CoinsWeekly Takes a Moment to Reflect
CoinsWeekly will be taking a break from July 4 to September 15, 2025, to perfect and implement its new concept. Look forward to opinionated commentary and in-depth numismatic information, when CoinsWeekly is back again after September 15!