Irrespective of how it happened, it's PMD on both sides - all the way. This seller should know better than to call it an 'Error'. I'm very disappointed to see him selling a 'shed job'. He'll get no more business from me!
With over 21,000 feedback, this seller will know without a doubt that this is simply garbage!
I have bought from this seller in the past. Posted a bunch of stuff 10 days after I paid for it so it took nearly 3 weeks to get here. I also have bought a die crack error threepence which turned out to be a scratch in the coin. All the normal coins I have got from this seller have been true to the listing but I would steer clear of his "error listings"