Exchange 2 euros for 28,000: Which coins are traded online for huge sums. Mismintings are coins that are not actually allowed to be issued due to an error, but are still used in payment transactions.
These include errors in the motif or material. The rarest misprints at a glance are the so-called ‘fried egg’ and the ‘mono-metal embossing’ But not every unusual-looking coin is unique. Historia Hamburg warns against buying expensive incorrect coinage.