1966 20 cent coin with mint error. I have five 1966 20 cent coins and all are the same other than this one. The middle of the coin is raised more than usual and the edges of the coin where the platypus is also is raised all around the coin. I have put the coin beside 4 other 1966 coins and you can see the difference. This is VERY RARE! It is not a wavy 1966 20 cent coin but I think this is even better and rarer and unique! this is a must have for any coin collector! If you have any questions don’t hesitate to message me. Thanks