There are many individual coins that are unintentional errors, for instance mules.
Some collectors actively seek them, while others don't collect them at all.
Currently, it's hard to find these coins within Numista, as they are displayed within the regular "common coins"; it would be better to have a different coin type.
An error is exactly that, an error. An error can happen to any coin. They don't need their own page. Mules are patterns. Common errors should be listed under the comment section, with additional ones written as a personal comment.
This coin should definately not be classed as a "pattern" as that would imply that this mule was deliberately struck (which it was not). Also this mule coin circulated freely as any regular coin meaning that out of the current classifications "common coin" would be most correct, however "error coin" would probably be most correct.
How should I list my New Zealand/ Bahamas mule? By the country written on the coin? By the denomination? Or both countries? I have mules of a single countries designs. And others that are of more than one country. Just curious about your thoughts.
Library Media Specialist, columnist, collector, and gardener...