If the coin were double struck it might leave an extra letter. But it should be more of an extra letters issue in that case:

Note the extra 'E' on this coin, but note also there are extra other letters on it. I'm not seeing that on your coin. Also note that the extra looking 'E' on your coin is smaller. If that area raised, incuse or level with the field?
Edited by coop
03/03/2017 1:43 pm