Well logically it was somewhere in the empire that the currency was accepted and I am just guessing but perhaps because of a shortage the coin was created by local officials.
It is an Imitation of a class C
follis that coinage was created between 1034-1041, I am sure you can find out more information on the empire at that time on how far it boarders were.
However I am afraid without more evidence of others examples of your coin, we will never know for certain.
