After all this discussion and Bruces correct comments, I am convinced that the coin was
altered.
The reason though can not be a quick restoration of a "worn out die" for two reasons:
a. The overall condition of the coin does not indicate an extensive wear at this particular
areab. Even so, being worn out in a spot could not be a problem for the coin to circulate normally and be accepted for everyday transactions.
So I believe that the alteration, which 100% sure is not modern (at least not during the last 100 or so years due to the uniform
patina as I mention in another post), was done for other reasons.
Either as an effort to create a variety (were there interested people-collectors back then??)
or from someone as a joke at
his spare time...
Imagine, someone centuries ago, was lauphing at me
But I am lauphing at him also because I enjoy every minute of this story and the
money I spent could just buy me 2-3 decent Mc Donalds meals