Spots on coins Mikulov

In 2022, collectors and investors could buy gold coins of the Czech National Bank with a face value of CZK 5,000 dedicated to the Mikulov Urban Monument Reserve.

You may already know that a number of owners have discovered unsightly red spots on these coins (in both standard and proof versions). If you have purchased coins with Mikulov, we ask you to examine them carefully.

In case you find stains, please visit one of the branches of the Czech Mint in Prague, Brno, Jablonec nad Nisou or Bratislava. Our colleagues will take the coins from you (each must be packed in its original capsule and etui, but keep the certificate with you) and arrange for their exchange for perfect pieces.

Attention - we are only able to make the exchange if you hand in the coins to us by 15 April 2023.

What is "gold rust"?

Pure gold does not corrode. So how is it possible for it to show stains?

It is a trace amount of silver that turns into red silver sulfide. However, this is not a defect, but a characteristic – a natural part of the production of gold coins.