Answering "Is it an error coin?"

[CanuckCoinGirl]

There seem to have been a lot of examples of post mint damage and other non-perfect images of coins shared asking if they are errors. Usually the examples are not errors, but looking through posts, it does not look like there has been any post that might give answers to newer people. This has some good examples and should work for coins of Canada - Royal Canadian Mint, but also the USA mints.
https://learn.apmex.com/learning-guide/ ... ror-coins/

[troubadour]

this is similar to the Jewett method to determine an error, starting with the blank, following by the die and finishing with the strike

Article in French that you can translate with google to find more about it
https://www.numicanada.com/pieces-de-mo ... c-f&id=403

[TBH]

Be wary of both those references.
They have errors.
A doubled die is not an error.
Die deterioration is not an error.
Etc. etc.

A better reference can be found here: https://www.error-ref.com/