In June 2017 Pobjoy Mint made 2 errors in text on 1 crown proof for 35th anniversary of liberation of the islands. The mint's handling of the problem is another example of a private mint ruining the hobby, as far as I am concerned.
Coin first included text "Britannia rules the waves" from song "Rule, Britannia". Error 1, the lyrics are "Britannia, rule the waves!", a command instead of statement. (This is the first I knew of the correct lyrics.) Error 2, "Britannia" should not have appeared on the coin, as the Royal Mint (UK) has the trademark "Britannia" used on coins (seems a bit far-fetched). To fix the errors, Pobjoy Mint stopped production at 7,329 coins with the text and struck 42,671 without the legend.
So while Pobjoy Mint made 2 errors, it also will benefit from the problem as there are now 2 versions of the coin to sell and increase profits. If the mint were ethical, it would have scrapped the wrong coins and made only the corrected version available for sale.
Will