Modified Effigy
https://en.numista.com/catalogue/pieces871.html
https://en.numista.com/catalogue/pieces7173.html
as on earlier coins the 'ghosting' effect meant the portrait was
showing through on the reverse. The main difference is in lettering spacing;
such as the : between BRITT:OMN is closer to the left on the first version and
is more in the middle on the modified version.
There are topics on the forum which have details.
