“An example sold at auction in 2013 for just under $1,300.” “This is a very visually striking mule error, and as such, it would be significantly more difficult to pull this coin out of circulation,” said Wengel. He has served as a senior grader at international grading events in Germany, China, and Hong Kong and as an instructor at the American Numismatic Association Summer Seminar on Advanced Study of World Coinage in 2023. Wengel is also the author of several articles on the attribution and authentication of coins, one of which won a Numismatic Literary Guild (NLG) award. He has served as an NGC grader for more than 12 years and has been the Senior Grading Finalizer of World Coins since 2020. While it’s not a division of the Professional Numismatists Guild (PNG), the PNG has designated NGC as its official authentication and certification service for rare coins. $2,000 Quarter? Check Your Pockets Before You Use This 2004 Coin Meet the Expertīen Wengel is a coin expert at Numismatic Guaranty Company (NGC), an independent entity based in Florida. It occurs when the dies used to strike coinage are not properly paired, resulting in an incorrect obverse/reverse combination for all coins struck from that specific pair of dies.” They are all error coins known as ‘mules’ in numismatics.

“However, there are a few that can certainly be found in circulation. “There aren’t a ton of options for valuable, circulating European coinage,” said Ben Wengel, an expert in authentication and the minting process who has handled, authenticated, and graded over a million coins, including many rarities that have brought six and seven figures at auction.

Is 20 euro cent still in use